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Cleaning a Conservatory Roof Safely

Thu, 22 Oct 2026 14:00:00 GMT

You sat in your conservatory all summer barely noticing the roof, and now the light coming through looks dull and green. A conservatory roof grimes up faster than you'd think, collecting moss, algae, leaves, and the dirt that washes down off the main roof above it.

It's also the trickiest bit of the house to clean. You can't walk on it, the panels are more fragile than they look, and it sits right where debris from the house roof lands. On a Durham home, where damp and moss are a constant, a conservatory roof needs regular attention, and it needs cleaning the right way so you don't crack a panel or take a tumble.

The quick answer: Clean a conservatory roof with gentle, low-pressure methods and soft brushes from a safe position, never by climbing onto it, so you clear the grime without cracking glass or polycarbonate.

1. Why Conservatory Roofs Get So Dirty

A conservatory roof sits low and flat compared with the main roof, so everything that comes off the house above ends up on it. Rain washes moss, grit, and algae down from the tiles, leaves gather in the low corners, and the near-flat pitch means little of it drains away on its own.

Durham's damp air speeds all of this up. The same moisture that greens the main roof settles on the conservatory glass and framework, and shaded spots under trees or beside the house grow a film of algae quickly. Left alone, that build-up blocks your light and starts to look permanently grubby.

2. The Safety Problem With These Roofs

The single most important rule is that a conservatory roof will not take your weight. The glass or polycarbonate panels are made to keep weather out, not to be stood on, and stepping onto one can send you straight through. This is where people get badly hurt trying to save a bit of money.

That means the whole job has to be done from the side, using long-reach poles and a stable ladder or platform on firm ground beside the conservatory. On many Durham properties the conservatory backs onto a patio or soft garden, which makes footing awkward, so setting up safely matters as much as the cleaning itself.

3. Glass or Polycarbonate: Know Your Roof

Conservatory roofs come in two main types, and it helps to know which you've got. Glass roofs are heavier and more scratch-resistant but still crack under impact or sudden temperature change. Polycarbonate is the lighter, twin-walled plastic sheeting, cheaper but softer and easy to scratch if you scrub it with the wrong brush.

Either way, harsh scrubbing and abrasive pads are out. Polycarbonate in particular marks easily, and once it's scratched it hazes and traps dirt worse than before. Knowing your roof type guides how gently you need to work and which brushes and cleaners are safe to use.

4. The Gentle Way to Clean It

The safe method is low pressure and soft tools. A soft-bristled brush on an extendable pole, worked with a gentle cleaning solution and plenty of water, lifts moss and algae without scratching. Work from the ridge down, rinse thoroughly, and let the water carry the loosened dirt away.

Avoid a domestic pressure washer on full blast, as it can force water through the seals between panels and into the framework, and can crack an older or already-stressed panel. The same soft wash thinking that protects a main roof applies here: gentle and patient beats forceful every time, especially on delicate conservatory glazing.

5. Don't Forget the Frame and Gutters

The panels are only part of it. The frames, glazing bars, and the little gutter that runs around the conservatory all collect dirt and moss, and a blocked conservatory gutter causes the same overflow and damp problems as any other. Clearing these is part of a proper clean.

Pay attention to where the conservatory meets the house wall, too, since leaves and debris pile up in that join and can hold water against the brickwork. On a Durham home that's exactly the kind of damp trap that leads to staining inside, so keeping that junction clear is well worth the effort.

6. How Often and When to Do It

A conservatory roof usually wants cleaning once or twice a year, more often if it sits under trees or on a shaded, north-facing side. Because so much debris comes down off the main roof, timing a conservatory clean alongside a roof and gutter clean makes a lot of sense.

Autumn is a natural time, once the leaves have fallen, to clear everything before winter. A spring clean then restores the light after the damp months. Keep to a rough routine and you avoid the thick, baked-on grime that's so much harder to shift once it's had a couple of years to build up.

Debris magnet: Everything washing off the main roof lands on the low, near-flat conservatory roof.
Never stand on it: Panels won't take your weight, so clean from the side with long-reach poles.
Know the material: Glass and polycarbonate need different care, and polycarbonate scratches easily.
Gentle only: Soft brushes and low pressure clean safely, while a jet wash risks seals and cracks.
Whole job: Clean the frames and the conservatory gutter, not just the panels, to prevent damp.

Frequently Asked Questions

Can I walk on my conservatory roof to clean it?
No, never. The panels are not designed to take your weight and you can fall straight through. All cleaning should be done from the side with long-reach tools and a stable ladder.

Can I pressure wash a conservatory roof?
It's best avoided. A pressure washer can force water through the panel seals into the frame and can crack older glazing. A gentle low-pressure clean with soft brushes is far safer.

Why does my conservatory roof get dirty so fast?
It sits below the main roof, so moss, grit, and leaves wash down onto it, and its low pitch means little drains away. Durham's damp air grows algae on it quickly too.

How often should I clean it?
Once or twice a year suits most conservatories, more if it's shaded or under trees. Doing it alongside a roof and gutter clean is an efficient way to keep on top of it.

Will cleaning it bring the light back?
Usually yes. Most of the dullness is surface algae, grime, and moss, so clearing it off restores a lot of the brightness, provided the panels themselves aren't scratched or clouded.

Conservatory roof gone green and dull?
Ben's Roof Cleaning cleans roofs, conservatories, and gutters across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Bring Back the Light Without the Risk

A clean conservatory roof makes a real difference to how bright and inviting the room feels, and it's not a job to gamble your safety on. Keep off the panels, work gently from the side, and clear the frames and gutters as well as the glass. Do it right, or have it done right, and your Durham conservatory stays light, clear, and dry all year round.

DIY Roof Cleaning: Why It's Rarely Worth the Risk

Sat, 17 Oct 2026 16:00:00 GMT

Your roof has gone green, the moss is thickening up, and you're eyeing that pressure washer in the shed thinking you could sort it yourself in an afternoon. It's a tempting idea, and plenty of people give it a go every year. It usually ends up costing far more than it saves.

Cleaning a roof looks straightforward from the ground, but it's one of those jobs where the risks aren't obvious until you're up there. On a typical Durham home, with steep slate, awkward access, and weather that keeps everything slick, DIY roof cleaning puts both you and your roof in harm's way. Here's an honest look at why it's rarely worth it.

The quick answer: DIY roof cleaning carries a real risk of a serious fall and often damages the tiles, so for most homes the money you'd save is not worth the danger or the repair bill.

1. The Fall Risk Is the Big One

Working at height is genuinely dangerous, and roofs are one of the most common places people are seriously hurt around the home. A wet, mossy slate roof is slippery underfoot, the pitch is steeper than it looks from below, and there's rarely anything to stop a slide once it starts.

Around Durham, a lot of homes are two full storeys, and the back lanes and sloping ground behind older terraces make it hard to even set a ladder safely. A fall from that height isn't a bumped knee, it's a hospital trip or worse. No roof clean is worth that, and it's the first reason to think twice.

2. Pressure Washers Do More Harm Than Good

The tool most people reach for is exactly the wrong one. A domestic pressure washer blasts water hard enough to strip the protective surface off tiles, force the granules off concrete tiles, and drive water up under slates where it soaks into the roof timbers.

On the older slate roofs common across Durham, that kind of force can crack and pit tiles that were perfectly sound. You end up with a roof that looks clean for a season but is now more porous, faster to grow moss again, and closer to needing repair. The professional approach is a gentle soft wash for good reason.

3. You Often Miss the Real Problem

Blasting the green off the surface treats the symptom, not the cause. Moss and algae grow back fast, especially in Durham's damp climate, because the spores and roots are still there. Without a proper treatment afterwards, you're likely to be back up that ladder within a year.

There's also what you can't see. Someone doing this for a living spots the cracked ridge tile, the slipped slate, or the early gutter fault while they're working. Do it yourself and those get missed, so the underlying issues that let water in carry on quietly while you've only tackled the appearance.

4. The Hidden Costs Add Up

DIY feels cheap until you total it up. To do it even semi-properly you'd need a tall ladder or tower, the right cleaning kit, a suitable treatment, and safety gear. Buy or hire all that for a one-off job and the saving over a professional shrinks fast.

Then there's the risk of getting it wrong. Crack a few slates on an older Durham roof and you're paying a roofer to replace them, sometimes matching aged slate that isn't cheap or easy to find. A job meant to save money can quite easily end up costing more than having it done right the first time.

5. Time, Effort and the Weather

Roof cleaning is slow, physical work, and doing it safely and thoroughly takes far longer than people expect. What you imagined as an afternoon can stretch across a whole weekend, and that's before you factor in Durham's habit of turning wet halfway through.

You also only get a narrow window of dry, calm weather when it's sensible to be up there at all. Wait for that, work around it, and add in the setup and clear-up each time, and the DIY route eats a lot more of your time than booking someone who does it day in, day out.

6. When DIY Might Just About Be Fine

To be fair, not every job is off limits. Clearing leaves from a ground-floor gutter on a single-storey extension, with a stable ladder on firm ground and someone footing it, is within reach for a careful person. Small, low, and easy to reach is a different matter to a full two-storey roof.

The line to draw is height and the roof surface itself. Once you're talking about getting onto or over the roof, dealing with heavy moss, or working on anything above one storey, it stops being a sensible DIY job. That's the point where the right kit and experience earn their keep.

Fall danger: Wet, steep roofs cause serious falls, and many Durham homes are a full two storeys.
Wrong tool: Pressure washers strip and crack tiles, leaving the roof more porous than before.
Surface only: DIY blasts off the green but leaves the roots, so moss returns within a year.
False saving: Ladders, kit, treatment, and broken tiles can cost more than a professional clean.
Know the line: Low, easy gutter work can be DIY, but anything on or above the roof shouldn't be.

Frequently Asked Questions

Can I just pressure wash my roof myself?
It's strongly discouraged. Domestic pressure washers strip the surface off tiles, force water under slates, and can crack older roofing, leaving the roof worse off and quicker to regrow moss.

Is DIY roof cleaning actually dangerous?
Yes. Roofs are a leading cause of serious falls at home, and a wet, mossy, two-storey Durham roof is exactly the kind of surface where a slip turns into a bad injury.

Will cleaning it myself save money?
Often not, once you add up ladders, kit, and treatment, plus the cost of replacing any tiles you break. A cracked slate on an older roof can be pricey to match and fix.

Why does the moss come straight back after I clean it?
Because blasting the surface leaves the spores and roots behind. Without a proper treatment to kill them off, the growth returns quickly in Durham's damp climate.

Is there any roof job I can safely do myself?
Clearing a low, easy-access gutter with a stable ladder and a helper is reasonable for a careful person. Anything on or above the roof, or above one storey, is best left to a professional.

Rather leave the roof to someone else?
Ben's Roof Cleaning cleans roofs and removes moss across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Save the Money, Skip the Danger

There's nothing wrong with being handy and tackling jobs around the house, but roof cleaning is one to think hard about. The fall risk is real, the tile damage is common, and the savings often vanish once the true costs come in. For most Durham homes, keeping both feet on the ground and letting someone with the right gear handle the roof is the smarter call.

Giving Your Roof a Spring Check After Winter

Tue, 13 Oct 2026 12:15:00 GMT

After a long, wet Durham winter, your roof has taken more of a beating than you'd think. Months of driving rain, hard frosts, and the odd gale coming off the Pennines all leave their mark, and much of the damage sits up there unnoticed until spring.

That first stretch of drier, brighter weather is the ideal moment to take stock. A quick spring check lets you catch the small problems winter left behind, a slipped slate here, a clogged gutter there, before the next round of wet weather turns them into a leak or a damp wall. It's a habit worth building, and it saves a lot of bother later in the year.

The quick answer: Give your roof a proper look each spring for slipped or cracked tiles, moss build-up, and gutter damage, so you can fix the small stuff before it becomes a costly repair.

1. Why Winter Is So Hard on a Roof

Winter attacks a roof in a few different ways at once. Rain and wind work at any loose tile or weak spot, while the freeze-thaw cycle does the quiet damage: water gets into a hairline crack, freezes, expands, and makes that crack a little bigger every cold night. By spring, a tile that was sound in October might be split.

Durham gets the full northern version of this, with plenty of frosts and long damp spells that never really let the roof dry. On the older slate roofs across the city and out in the pit villages, that repeated freezing is exactly what loosens slates and opens up gaps along the ridge and around the chimney.

2. Looking for Slipped and Cracked Tiles

Start from the ground with a good look up, ideally from across the street where you can see the whole slope. You're looking for tiles or slates that have slipped out of line, gaps where one has gone missing, and any that look cracked or lifted. A pair of binoculars makes this a lot easier and keeps you off a ladder.

Pay attention to the lower edges and the valleys where two slopes meet, since that's where slipped tiles tend to gather and where water pools. On a Durham terrace, also cast an eye along the shared ridge line, as a cracked ridge tile up there can let water straight into the roof space.

3. Checking the Gutters and Downpipes

Winter fills gutters with the last of the autumn debris plus whatever moss has washed down in the rain, and freezing can crack or pull sections loose. Watch what happens in a spring shower: water should gush out of the downpipe, not sheet over the front edge or dribble from a joint.

Look for sagging runs, gaps where a joint has come apart, and green streaks on the wall below that show where water has been overflowing. Getting the gutters cleared and flowing now, before spring showers and summer storms, keeps water off your walls through the rest of the year.

4. Dealing With Winter Moss Growth

Moss does a lot of its growing over the damp winter months, so spring is often when you first notice just how much has taken hold. Those green cushions look harmless, but they hold water against the tiles and shed debris straight into the gutters, keeping the whole roof damp long after the rain stops.

Durham's climate makes this a near-constant battle, especially on shaded, north-facing slopes. Spring is a good time to clear heavy moss and follow up with a treatment, so the roof goes into the drier months clean rather than carrying a wet green layer into summer and beyond.

5. Signs Water Got In Over Winter

Some winter damage shows up inside rather than out. Head up into the loft on a bright day and look for daylight coming through where it shouldn't, along with damp patches on the timbers, water stains on the felt, or a musty smell that says moisture has been getting in.

Downstairs, check the tops of upstairs walls and ceilings for fresh stains or blistered paint that weren't there in autumn. Catching a small leak now, while it's just a mark, is far cheaper than waiting until it's spread across a ceiling or rotted a roof timber on a solid-walled County Durham home.

6. When to Call Someone In

Plenty of the spring check you can do yourself from the ground with a careful eye. What you shouldn't do is start climbing about on a wet, mossy roof to fix what you find, since that's how people come to grief, particularly on the steeper pitches and taller terraces around Durham.

If your check turns up slipped slates, heavy moss, or gutter damage, that's the point to get someone with the right access equipment to sort it safely. A professional can also spot the things that are easy to miss from the pavement, and deal with the roof and gutters in one go before the busy weather returns.

Freeze damage: Winter's freeze-thaw cycle splits tiles and loosens slates, so spring is when it shows.
Ground-level look: Check from across the street with binoculars for slipped, missing, or cracked tiles.
Gutter test: Watch a spring shower to see if water runs out cleanly or overflows the edge.
Winter moss: Growth peaks over the damp months, so clear and treat it before summer.
Leave the climbing: Fixing what you find on a wet, mossy roof is a job for someone with proper access kit.

Frequently Asked Questions

When should I check my roof after winter?
Early spring, once the worst of the frosts have passed and you get a few drier, brighter days. That's when winter damage is visible and there's still time to fix it before wetter weather returns.

What am I looking for in a spring roof check?
Slipped, missing, or cracked tiles, heavy moss growth, and gutter damage or overflow. Inside, check the loft and upstairs ceilings for damp patches or daylight coming through.

Can I do the check myself?
The looking part, yes, mostly from the ground with binoculars. The fixing part is safer left to someone with proper access equipment, especially on a wet or steep roof.

Why does moss seem worse in spring?
Moss grows most over the damp winter, so spring is when you notice how much has built up. Clearing and treating it then keeps the roof clean through the drier months.

Is a small leak really worth sorting straight away?
Yes. A minor leak is cheap to fix while it's just a stain, but left alone it can rot timbers and spread across ceilings, which turns into a much bigger job.

Roof come through winter looking worse for wear?
Ben's Roof Cleaning cleans roofs and clears gutters across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

A Spring Look That Saves a Summer Headache

Ten minutes with a pair of binoculars each spring is one of the cheapest bits of home care going. You catch the slipped slate before it lets water in, the blocked gutter before it soaks a wall, and the moss before it smothers the roof. Get ahead of it now, and your Durham roof carries you comfortably through to next winter.

Lichen on Your Roof and Why It's So Stubborn

Sat, 10 Oct 2026 11:30:00 GMT

You've probably seen those crusty, pale patches clinging to a roof and wondered what on earth they are. They look a bit like splashes of dried paint, grey-green or mustard yellow, and once you notice them you start spotting them on roofs all over your street.

That's lichen, and if it's taken hold on your Durham roof you'll know how firmly it grips. Moss you can often brush off, but lichen seems welded to the slate. It's one of the most common growths on roofs in the North East, and it's also one of the most stubborn to shift, which is exactly why it puzzles so many homeowners.

The quick answer: Lichen is a tough, slow-growing organism that bonds tightly to the roof surface, so it can't just be brushed off and needs a proper soft wash and treatment to remove without damaging the tiles.

1. What Lichen Actually Is

Lichen isn't a single plant. It's a partnership between a fungus and an alga living together, which is part of why it's so hardy. The fungus provides the structure and grip while the alga makes food from sunlight, and between them they can survive on bare rock, stone, and roof tiles where little else would.

Because of that toughness, lichen shrugs off conditions that would kill most growth. It handles dry spells, frost, and pollution, and it grows very slowly, which means by the time you notice a decent patch it's been settling in for a good while. That slow, tenacious growth is the root of why it's so hard to remove.

2. Why Durham Roofs Get So Much of It

Lichen loves clean, damp air, and Durham offers plenty of both. Away from heavy traffic and industry, the air here suits it well, and the constant moisture rolling up the Wear valley keeps roof surfaces damp enough for it to thrive. The older, weathered slate on the city's period homes gives it exactly the rough footing it likes.

You'll see it worst on the shaded, north-facing slopes that never really dry out, and on roofs near the wooded riverbanks and greener edges of the city. Out in the former pit villages, the mix of open skies and damp ground makes plenty of roofs a happy home for it as well.

3. Why It Clings So Hard

The reason lichen is so stubborn comes down to how it attaches. It doesn't just sit on the surface like a dusting of algae. It puts down root-like threads that work into the tiny pits and pores of the tile, gripping the surface so tightly that pulling it off can take flakes of the tile with it.

This is why scraping and heavy pressure washing are such a bad idea on a lichen-covered roof. On older Durham slate especially, blasting the lichen off can strip and pit the surface, leaving the tile rougher and more open to the next round of growth. The grip that makes lichen so tenacious is also what makes brute force so damaging.

4. Is Lichen Bad for the Roof

Lichen is slow, so it's less of an immediate threat than a thick moss blanket, but it isn't harmless. It holds moisture against the tile surface, and that constant dampness works away at the tile over time, especially through the freeze and thaw of a North East winter when trapped water expands as it freezes.

On the whole, the bigger issue with lichen is that it points to a roof that stays damp, which usually means other growth is welcome too. A roof crusted with lichen is often carrying moss and algae as well, and together they keep the whole surface wetter than it should be. Dealing with the lot at once is the sensible move.

5. How to Remove It Properly

The right way to clear lichen is patient rather than forceful. A soft wash with the correct treatment kills the lichen and loosens its grip so it can be cleared without gouging the tile. It takes longer than a quick blast, but it protects the roof rather than wearing it down.

A biocide treatment is often the key part, because lichen is so slow to grow and so slow to die. The treatment gets into the growth and kills it off over the following weeks, after which the remains weather away and can be gently cleared. Rushing it with a jet wash might look quicker on the day but costs you in tile damage later.

6. Keeping It From Coming Back

Because lichen grows slowly, a good clean and treatment buys you a long stretch before it returns. Keeping the roof as dry and open to light as possible helps, so cutting back overhanging branches that shade and drip onto the roof makes a real difference on a damp Durham property.

Clear gutters matter too, since a roof that drains freely dries out faster between downpours. Pair a proper clean with a follow-up treatment and a bit of ongoing attention, and you keep the crusty patches from creeping back across your slate for years rather than months.

What it is: A hardy fungus-and-alga partnership that survives where most growth can't.
Why it grips: Root-like threads work into the tile's pores, so it can't be brushed off cleanly.
Durham factor: Clean, damp air and weathered slate make local roofs ideal for lichen.
Never blast it: Pressure washing strips lichen and tile together, leaving the surface worse.
Proper removal: A soft wash and biocide treatment kills it at the root and protects the roof.

Frequently Asked Questions

What are the crusty patches on my roof?
That's lichen, a slow-growing organism made of a fungus and an alga together. It bonds tightly to slate and tile, which is why it looks crusty and won't simply brush away.

Why can't I just scrape lichen off?
Its root-like threads grip into the tile surface, so scraping or blasting it pulls flakes of tile away too. That leaves the roof rougher and more prone to fresh growth.

Is lichen damaging my roof?
It's slower to harm a roof than thick moss, but it holds moisture against the tile, which matters through winter freezes. It also signals a roof that stays damp and carries other growth.

How do you remove lichen safely?
With a low-pressure soft wash and a biocide treatment that kills it at the root over a few weeks. The dead growth then weathers away without damaging the tiles.

Will the lichen come back?
It grows slowly, so a proper clean and treatment lasts a good while. Cutting back shading branches and keeping gutters clear helps keep it from returning quickly.

Got stubborn lichen on your roof?
Ben's Roof Cleaning removes moss and lichen across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Patience Beats Pressure Every Time

Lichen earns its reputation as the most stubborn thing on a roof, but stubborn doesn't mean impossible. The trick is treating it the right way, killing it at the root and letting it weather away, rather than attacking it with a pressure washer and damaging your slate in the process. Handle it properly and your Durham roof stays clear for the long haul.

Roof Care for Landlords and Rental Properties

Thu, 08 Oct 2026 11:15:00 GMT

If you let out a property, the roof is probably the last thing you look at when everything seems fine. Tenants rarely mention it, it's out of sight, and there's always something more pressing to spend money on. Then a damp patch appears on a bedroom ceiling and suddenly it's an urgent, expensive problem.

With a good stock of terraced and older housing across Durham going to the rental market, from student lets near the university to family homes in Belmont and Framwellgate Moor, plenty of landlords are looking after roofs that grow moss quickly and sit through wet winters. A little routine care goes a long way to keeping those roofs, and your tenants, trouble-free.

The quick answer: Keeping a rental roof clean and its gutters clear prevents damp, protects the building, and heads off the repair bills and tenant complaints that come from a neglected roof.

1. Why the Roof Matters More on a Rental

In your own home you'd probably notice a small leak early, because you're there every day and you care about the place. In a rental, problems often go unreported until they're bad, either because the tenant doesn't think to mention a slow stain or assumes you already know.

That gap is where small issues turn into big ones. A blocked gutter that overflows for a season, or a mossy roof holding damp against the tiles, can quietly damage the fabric of a Durham terrace before anyone flags it. By the time it's obvious inside, the repair is far larger than a routine clean would have been.

2. Damp, Mould and Your Responsibilities

Damp and mould in rented homes are taken seriously now, and landlords are expected to keep properties free of the kind of damp that affects a tenant's health. A lot of that damp starts outside, with water getting in through overflowing gutters or a roof that never dries out.

Sorting the outside is often the real fix. You can wipe mould off a wall all day, but if a blocked gutter is soaking that wall from the outside every time it rains, it comes straight back. Keeping gutters clear and the roof in good order deals with the cause rather than the symptom, which is exactly what a proper response to a damp complaint needs.

3. The Cost of Leaving It

Neglect is expensive on a rental in ways that go beyond the repair itself. There's the builder's bill, sure, but also the redecoration, the possible loss of rent if the property becomes hard to live in, and the strain on a tenant relationship when someone feels their home is damp and cold.

On the solid-walled homes common across County Durham, water that gets in has a clear path to the inside, so a long-ignored gutter can lead to replastering, not just a wipe-down. Set against that, a routine roof and gutter clean is a small, predictable cost that protects a much larger asset.

4. Building It Into Your Routine

The easiest approach is to treat roof and gutter care like any other scheduled maintenance, the same way you'd service a boiler. An annual gutter clear, ideally in late autumn once the leaves are down, keeps water flowing through the wettest months and takes the guesswork out of it.

A roof clean and moss treatment doesn't need doing every year, but having the roof looked over now and then means you catch slipped slates, cracked ridge tiles, or heavy moss before they cause a leak. For a landlord with a few properties around Durham, booking these together often makes sense and keeps everything on one schedule.

5. Between Tenancies Is the Ideal Time

A void period, when one tenant has left and the next hasn't moved in, is the perfect window for roof work. The property is empty, access is easy, and there's no disruption to anyone living there. It's also when you're likely inspecting and refreshing the place anyway.

Getting the roof and gutters sorted between lets means the new tenant moves into a property that's genuinely in good order, not one with a problem brewing above the ceiling. It's a small thing that helps a tenancy start on the right foot and reduces the chance of a call-out in the first wet month.

6. Kerb Appeal and Letting the Property

A clean roof helps a property let, too. When prospective tenants pull up outside, a roof streaked with green and gutters sprouting weeds send a quiet message that the place isn't well looked after, even if the inside is spotless. First impressions count on the rental market.

A tidy roofline and clear gutters make a Durham terrace look cared for and well maintained, which tends to attract tenants who'll treat it the same way. It's a modest bit of upkeep that pays back in easier lettings and fewer voids.

Unreported problems: Tenants often don't flag slow leaks or stains, so small roof issues grow before you hear about them.
Damp duty: Much rental damp starts outside, so clearing gutters and roofs tackles the real cause of tenant complaints.
Predictable cost: A routine clean is far cheaper than replastering after a season of overflow on solid walls.
Void windows: Between tenancies is the easiest time to get roof and gutter work done with no disruption.
Better lettings: A clean roofline signals a well-kept property and helps attract and keep good tenants.

Frequently Asked Questions

Am I responsible for roof cleaning as a landlord?
Keeping the property free of damp and disrepair is your responsibility, and roof and gutter upkeep is part of that. Clean gutters and a sound roof are how you prevent the damp problems that fall to you to fix.

How often should a rental roof be checked?
An annual gutter clear is sensible, with the roof looked over every year or two. Properties under heavy tree cover or with a lot of moss may need more frequent attention.

Can dealing with the roof fix a tenant's damp complaint?
Often yes. If the damp is caused by overflowing gutters or a moss-laden roof, clearing the cause outside stops the water getting in and lets the wall dry out.

When is the best time to do roof work on a rental?
Between tenancies is ideal, since the property is empty and access is easy. Failing that, late autumn is a good time to clear gutters before winter.

Can you do several properties at once?
Yes. Landlords with a few properties around Durham often book roof and gutter work together, which keeps everything on one schedule and one visit where possible.

Looking after a rental roof in Durham?
Ben's Roof Cleaning cleans roofs and clears gutters across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Protect the Asset, Keep the Tenant Happy

A roof is one of the most valuable parts of any rental, and it's also one of the cheapest to look after if you stay ahead of it. Routine gutter clearing and the occasional roof clean keep damp at bay, keep your tenants comfortable, and keep the building sound. For a landlord, that's about as sensible as maintenance gets.

How a Biocide Treatment Keeps Your Roof Cleaner for Longer

Sun, 04 Oct 2026 08:30:00 GMT

You get your roof cleaned, it looks fantastic, and then within a year or two the green is creeping back. It's a familiar and frustrating story, and it leaves a lot of people wondering whether roof cleaning is even worth doing if the moss just returns.

The missing piece is usually the treatment that should follow the clean. A soft wash gets the roof looking right, but a biocide treatment is what slows the moss and algae coming back. If your roof was cleaned once and left at that, it's no surprise the growth returned quickly, especially on a damp Durham roof that spends half the year wet.

The quick answer: A biocide is a chemical treatment sprayed onto the roof that kills off moss, algae, and lichen spores at the root, so the roof stays clean for far longer than washing alone.

1. What a Biocide Actually Does

A biocide is a treatment designed to kill living organisms like moss, algae, and lichen. Applied to a roof at low pressure, it soaks into the surface and into the tiny spores and root threads that a simple wash leaves behind. Those leftovers are what let growth bounce back so fast, and the biocide deals with them.

Think of it like weeding a border. Pulling the tops off makes it look tidy for a week, but if the roots stay in, everything regrows. A biocide is the equivalent of getting the roots too, so the roof starts genuinely clean rather than just looking clean on the surface.

2. Why Durham Roofs Need It More Than Most

This region is about as friendly to moss as anywhere in England. The damp air off the Wear valley, the cool temperatures, and the long wet spells give spores everything they need to settle and spread. A north-facing slope that barely sees the sun can green over within a couple of seasons.

On the older slate and stone-built homes around the city and out in the former pit villages, that growth takes hold in the rougher, weathered surfaces and holds moisture against the roof. A biocide treatment gives Durham roofs the head start they need against a climate that's constantly trying to grow things on them.

3. When the Treatment Is Applied

The usual order is clean first, treat second. The soft wash clears the bulk of the moss and grime, and then the biocide goes on to tackle what's left at the microscopic level. Applied to a clean surface, it can reach the roof properly rather than sitting on top of a layer of moss.

Some jobs are done the other way round, with a biocide applied first and left to kill the growth so it can be cleared more easily later. Either way, the treatment is sprayed on evenly and left to do its work over the following weeks. It isn't rinsed off, so rain and time carry the dead growth away gradually.

4. How Long the Results Last

A roof that's been washed and then treated stays clean much longer than one that's only been washed. Rather than seeing green return within a year, you can often go several years before a roof needs attention again, depending on how shaded and damp your particular roof is.

Nothing keeps a Durham roof spotless forever, since spores are always blowing about and the climate never really dries out. But a good treatment stretches the gap between cleans a long way, which means less disruption and better value from each visit. A roof near the wooded river banks will always want more frequent care than one on an open, breezy hillside.

5. Is It Safe for the Roof and Garden

Applied properly, a biocide is designed for the job and used at the right strength for the surface. It's sprayed at low pressure, so unlike heavy jet washing it won't strip the surface off slate or blast the granules off concrete tiles. That gentleness matters a lot on the older roofs common across Durham.

A careful applicator will take sensible steps to protect planting, downpipes, and anything below the working area, and will pick the right conditions so the product isn't immediately washed off by rain. Done by someone who knows what they're doing, it's a controlled treatment rather than a case of soaking everything in sight.

6. Getting the Most From a Treatment

The treatment works best as part of a plan rather than a one-off. Keeping the gutters clear so the roof drains properly, dealing with overhanging branches that drip and shade, and having the roof checked every so often all help the results last.

It's also worth being realistic. A biocide slows regrowth, it doesn't stop the weather. On a heavily shaded Durham roof you might pair a treatment with a lighter clean every few years to stay on top of it, and that's still far less work than scrubbing thick moss off every season.

Root-level kill: A biocide tackles the spores and root threads a wash leaves behind, not just the surface growth.
Climate match: Durham's damp, cool air regrows moss fast, so treatment matters more here than in drier regions.
Order of work: Usually clean first, then treat, so the product reaches the roof surface properly.
Longer gaps: A treated roof can go several years between cleans rather than greening over within one.
Gentle method: Low-pressure application protects slate and tile surfaces that jet washing would damage.

Frequently Asked Questions

What is a roof biocide?
It's a treatment sprayed onto the roof that kills moss, algae, and lichen at the root. It targets the spores a normal wash leaves behind, which is what slows the growth coming back.

How long does a biocide treatment last?
Often several years, though it depends on how shaded and damp your roof is. A north-facing roof near trees will need attention sooner than an open, sunny one.

Does it damage the roof?
No, when applied correctly. It goes on at low pressure and at the right strength, so it treats the growth without stripping slate or tile surfaces the way heavy pressure washing can.

Do I need it every time the roof is cleaned?
Pairing a clean with a treatment gives the best value because the results last longer. Skipping the treatment usually means the moss returns much faster.

Will it harm my plants?
A careful applicator protects planting and surrounding areas and chooses the right weather so the product isn't washed straight off. Done properly, it stays a controlled treatment.

Want your roof to stay clean for longer?
Ben's Roof Cleaning cleans roofs and removes moss across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Clean Once, Stay Clean Longer

Washing a roof is only half the job on a climate as damp as ours. The treatment that follows is what turns a short-lived tidy-up into a proper clean that holds for years. If your last roof clean didn't last, the answer usually isn't cleaning more often, it's finishing the job with a treatment that keeps the moss from coming straight back.

Clearing Autumn Leaves From Your Gutters

Tue, 29 Sep 2026 17:00:00 GMT

You can spend a whole autumn raking leaves off the lawn and never once think about the pile building up in your gutters. Yet that's exactly where fallen leaves cause the most trouble, out of sight along the roofline where you can't see them from the ground.

Durham has no shortage of mature trees, from the wooded banks along the Wear to the sycamores and limes lining older streets. Come October the leaves come down in earnest, and a good number of them land on roofs and wash straight into the gutters. Left there, they turn into a soggy dam that stops your gutters doing their one job just as the wettest months arrive.

The quick answer: Clear the leaves out of your gutters in late autumn, once most have fallen, so water can drain freely before winter frosts turn any blockage into a bigger problem.

1. Why Leaves Are Such a Problem in Gutters

A few dry leaves would blow away, but that's not how it works here. Once leaves get wet they clump together, sink to the bottom of the gutter, and mat into a dense layer that water can't get past. That mat then catches more debris, grit, and moss, and the blockage grows week by week.

The narrow gutters on many Durham terraces fill quickly, and the leaf litter packs tightly into the mouth of the downpipe where the channel narrows. Once that entry point is plugged, the whole run backs up and starts spilling over the edge every time it rains, which around here is often.

2. When to Clear Them in Durham

Timing matters more than people expect. Clear too early, in September, and the bulk of the leaves haven't fallen yet, so you'll be doing it again in a month. The sweet spot is late autumn, usually late October into November, once the trees are mostly bare.

If your house sits near heavy tree cover, say the leafier parts of Neville's Cross or a street backing onto the river banks, you may need two goes: one mid-autumn to take the first heavy fall, and a second once the last leaves are down. Getting it done before the first hard frosts is the goal.

3. What Happens if You Leave It

Ignore the gutters through autumn and you're setting up for a wet winter. Blocked gutters overflow, and that water runs down the wall below and soaks into stone and brick. On the solid-walled homes common across County Durham, that soaking finds its way through to damp patches inside.

Winter makes it worse. When water sits in a leaf-clogged gutter and then freezes, the ice can crack joints, split seams, and pull sections away from the fascia. A gutter that was merely blocked in November can be damaged and leaking by February, which turns a simple clean into a repair job.

4. Doing It Yourself, Safely

Plenty of people clear their own gutters, and on a modest bungalow with easy access that's fair enough. The trouble is height and footing. Wet leaves make ladders slippery, and the uneven ground and back lanes behind many Durham terraces don't give a ladder a stable base.

If you do tackle it, use a stable ladder on firm ground, have someone foot it, and never lean out to reach that last bit. Scoop the debris into a bucket rather than dropping it, and flush the gutter through with a hose afterwards to check the downpipe actually runs clear. If the roof is two storeys or more, it's safer left to someone with the right kit.

5. Keeping Gutters Clearer for Longer

The leaves are only half the story. A lot of what blocks a Durham gutter is moss washed down off the roof itself, and if the roof stays mossy the gutter keeps refilling no matter how often you clear it. Dealing with the roof and the gutters together gives you a longer clear run.

Gutter guards and brushes can help slow the build-up, though they're not a fix-and-forget solution and still need checking. For most homes, a reliable seasonal clear-out is the simplest approach: get it done each autumn and you head into winter with water flowing where it should.

6. Why It Pays Off

A clear gutter protects far more than the gutter itself. It keeps water off your walls, away from your foundations, and out of the roof space, which saves you from damp, mould, and the repair bills that follow. For the small effort of one autumn clean, that's a good return.

It also spares your roof. When gutters overflow, water can back up under the lowest course of tiles or slates and get into the timbers. Keeping the gutters running through a wet Durham winter is one of the quiet ways you keep the whole roof sound.

Best timing: Late autumn, once most leaves are down, before the first hard frosts set in.
Two-clear homes: Properties under heavy tree cover often need clearing twice in the season.
Main risk: Overflow soaks solid walls and freezing debris cracks joints and seams.
Safety first: Wet leaves and uneven ground make ladder work risky, especially on taller houses.
Longer results: Clearing roof moss at the same time stops gutters refilling so quickly.

Frequently Asked Questions

When is the best time to clear gutters of leaves?
Late autumn, once the trees are mostly bare. In Durham that usually means late October into November, timed to beat the first hard frosts.

How often do gutters need clearing?
Once a year is enough for many homes, but properties near heavy tree cover often need two clears in autumn plus a check after winter.

Can I just leave the leaves to rot down?
No. Rotting leaves mat into a dense blockage that stops the gutter draining, so they cause overflow and damp rather than quietly disappearing.

Is it safe to clear my own gutters?
On a low, easy-access roof with a stable ladder and someone footing it, many people manage fine. On two storeys or more, or with uneven ground, it's safer left to a professional.

Why do my gutters block again so quickly?
Usually because moss keeps washing down off the roof. Cleaning the roof as well as the gutters keeps them clearer for much longer.

Want your gutters cleared before winter?
Ben's Roof Cleaning clears gutters and removes moss across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Get Ahead of the Autumn Fall

Leaves in the gutter are one of those jobs that's easy to put off until a wet patch or a dripping downpipe forces the issue. Handle it early, before winter locks everything in ice, and you save yourself the mess and cost that a blocked gutter brings. One good clear each autumn keeps the water moving and your Durham home dry.

How Blocked Gutters Lead to Damp Walls

Sun, 27 Sep 2026 08:15:00 GMT

You probably don't give your gutters a second thought until a dark, spreading patch turns up on an upstairs wall. By the time you notice it inside, water has usually been getting in for weeks, sometimes months, quietly soaking into the stone and brick every time it rains.

Here in Durham, where the wet comes off the Wear valley and hangs about for days, a blocked gutter has plenty of chances to do damage. Most people assume damp walls are a plumbing fault or rising damp from the ground. Very often the real culprit is sitting six feet above your head, clogged with moss and leaves and overflowing every time the sky opens.

The quick answer: When gutters block, rainwater spills over the edge and runs straight down your walls, and that constant soaking works its way through to the inside as damp patches, peeling paint, and a musty smell.

1. How a Blocked Gutter Actually Overflows

A gutter has one job, which is to catch the water running off your roof and carry it to the downpipe. When moss, leaf litter, and grit build up in the channel, that water has nowhere to go. It backs up, fills the gutter to the brim, and then tips over the front lip in a sheet.

On the older stone terraces around Gilesgate and the red-brick streets near the city centre, the gutters are often the original cast iron or a narrow uPVC replacement that fills fast. Add the moss that Durham roofs grow so freely, and it doesn't take much rain before the whole run is overflowing rather than draining.

2. Where the Water Goes Once It Spills

Water that pours over a gutter edge doesn't drift away politely. It runs straight down the wall below, following the render, the pointing, and any little ledge it can find. Every downpour sends another wash of water over the same stretch, so one blocked section tends to soak one patch of wall again and again.

The stone and brick that Durham homes are built from will hold that moisture like a sponge. In a former pit village such as Belmont or out toward Framwellgate Moor, plenty of houses have solid walls with no cavity, so once water gets into the outer face it has a clear path through to the plaster inside.

3. The Link Between Overflow and Damp Walls

Damp on an internal wall almost always traces back to water getting in from outside. When a gutter overflows in the same spot for months, the wall never fully dries out, especially through a North East winter when there's barely a dry day to help it along. The moisture creeps inward until it reaches the plaster and shows as a stain.

You'll often see it start high up, near the ceiling or the top corner of a room, because that's closest to the leaking gutter. Peeling wallpaper, blistered paint, and a cold, musty smell are the usual first signs. Left alone, the damp feeds mould and can start to rot skirting boards and window reveals.

4. Why Durham Weather Makes It Worse

Durham sits in a cool, damp corner of the country, and the rain that rolls in off the Pennines and up the Wear valley keeps roofs and walls wet for long stretches. That damp air is exactly what moss loves, so gutters here clog faster than they would in a drier part of England.

Winter piles on the pressure. When an overflowing gutter freezes, the ice expands and can crack the joints or push the whole run out of line, so even after a thaw the water keeps spilling in the wrong place. By the time spring arrives, a wall near Neville's Cross that's been soaked all season can be properly saturated.

5. Signs Your Gutters Are Behind the Problem

The clearest tell is watching what happens during heavy rain. If you see water sheeting over the front of the gutter or running down the wall in a curtain rather than gushing out of the downpipe, the channel is blocked somewhere above.

Between showers, look for green streaks or a dark tide mark on the wall directly under a gutter joint. Plants sprouting out of the gutter, sagging sections, and grit or moss washed onto the path below all point the same way. Match a stubborn indoor damp patch to a gutter fault right above it and you've usually found your answer.

6. How Regular Gutter Cleaning Breaks the Cycle

Clearing the gutters so water actually reaches the downpipe is the single most effective thing you can do to stop this kind of damp. Once the channel runs free, the wall below gets a chance to dry out, and the staining inside can settle rather than spreading further.

For most Durham homes a clear-out once or twice a year does the job, timed for after the autumn leaves come down and again after winter. If your roof grows a lot of moss, pairing gutter cleaning with a proper roof clean keeps debris from washing straight back down and refilling the channel a few weeks later.

Overflow point: Blocked gutters tip water over the front edge, straight onto the wall below rather than into the downpipe.
Solid walls: Many older Durham houses have no cavity, so outer-face soaking passes through to the inside plaster.
Weather factor: Long wet spells and winter freezing keep walls saturated and worsen the damage.
Early signs: High-up stains, peeling paint, and a musty smell usually appear before anything else.
The fix: Regular gutter clearing, ideally alongside moss removal, keeps water where it belongs.

Frequently Asked Questions

Can a blocked gutter really cause damp inside my house?
Yes, very commonly. Overflowing water soaks the outside wall, and with solid stone or brick it works through to the plaster inside, showing as damp patches and peeling paint.

How can I tell if it's the gutter and not rising damp?
Gutter damp usually appears high on the wall, near the ceiling, while rising damp starts low near the floor. If the stain sits directly under a gutter joint that overflows in the rain, the gutter is the likely cause.

How often should Durham gutters be cleaned?
Once or twice a year suits most homes here. Autumn after the leaves fall is the key one, with a second clear after winter if your roof sheds a lot of moss.

Will cleaning the gutter fix the damp straight away?
It stops fresh water getting in, which is the first step. The wall then needs time to dry out, and any existing internal damage may still need drying and redecorating.

Do you clean roofs and gutters together?
Yes. Clearing moss off the roof stops it washing down and refilling the gutters, so doing both together tends to keep things clear for longer.

Worried a blocked gutter is soaking your walls?
Ben's Roof Cleaning clears gutters and removes moss across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Sort the Gutter and You Sort the Wall

Damp walls are miserable to live with and expensive to put right once they take hold, yet the cause is often something as simple as a gutter full of moss. Keep the water running where it should, and you spare your walls the slow soaking that leads to stains, mould, and rot. A clear gutter really is the cheapest damp-proofing your Durham home can have.

Chimney, Flashing and Ridge: The Bits People Forget

Mon, 21 Sep 2026 08:30:00 GMT

When you think about your roof, you probably picture the broad slopes of tile or slate. That's fair, but it's not usually where the trouble starts. The bits that let water in are the joins and edges: the chimney, the flashing, and the ridge. These are the parts most people never look at, and they're exactly where a roof tends to fail first.

It makes sense when you think about it. A flat run of tiles sheds water easily, but wherever the roof changes shape or meets something else, water has a chance to find a way in. Those transition points do the hardest work, and they're worth understanding, because catching a problem there early saves you a much bigger repair down the line.

The quick answer: The chimney, flashing, and ridge are the vulnerable joins where most roof leaks begin, so keeping them clear of moss and checking them during a clean matters far more than the state of the open tiles.

1. Why the joins matter more than the tiles

The open field of a roof is the easy part. Tiles and slate are designed to overlap and shed water down the slope, and they do that job well for decades. It's where the roof meets something else that the design gets tested, because water collects at those points and looks for any weakness.

The chimney, the flashing, and the ridge are all these kinds of junctions. They rely on seals, mortar, and metalwork rather than simple overlap, and those materials wear over time. On Durham's older terraces, where many roofs and chimneys have stood for a century or more, these joins have taken a lot of weather and deserve a close eye.

2. The chimney and its weak points

Chimneys are a classic trouble spot. Where the brickwork meets the roof there's a join that has to stay watertight, and the mortar around the chimney and its flaunching up top can crack and crumble with age. Once that happens, water gets in and works down into the roof and the rooms below.

Moss loves a chimney too, gathering in the mortar joints and around the base where damp lingers. Plenty of Durham's period homes still have their original chimneys, tall and exposed to everything the northeast weather throws at them. Keeping that area clear and sound is a big part of keeping the whole roof dry.

3. Flashing: the metal that seals the gaps

Flashing is the metal, usually lead, that seals the joins around chimneys, in valleys, and where the roof meets a wall. It's what stops water sneaking into the gaps that tiles alone can't cover. When it's sound, you never think about it. When it lifts, cracks, or corrodes, it becomes a direct route inside.

Wind and the freeze-thaw of a Durham winter are hard on flashing, working at any loose edge until water can get behind it. Moss building up along a flashing line traps damp against the metal and the joint, making things worse. Checking the flashing while a roof is being cleaned is one of the most useful things a proper look from up top can turn up.

4. The ridge along the top

The ridge is the line along the very top where the two slopes meet, capped by ridge tiles. Traditionally these are bedded on mortar, and that mortar is another thing that cracks and loosens over the years. A loose ridge tile is both a leak risk and, in a high wind, a safety one.

Durham gets its share of exposed, blustery weather, especially on higher ground away from the shelter of the valley. That wind works at any ridge tile that's already loose on failing mortar. Spotting a slipped or wobbly ridge tile early, before it comes off entirely, is far better than dealing with the water damage or the fallen tile afterwards.

5. How moss makes these spots worse

Moss doesn't just sit on the open tiles, it gathers in exactly these vulnerable joins. It packs into mortar joints, along flashing lines, and around ridge tiles, holding damp against the very materials that are meant to keep water out. That trapped moisture speeds up the cracking and corrosion.

In the freeze-thaw cycle of a northeast winter, moss-held water expands as it freezes and prises at mortar and metalwork. So the moss isn't only a cosmetic issue at these points, it's actively working on the weak spots. Clearing it from the joins during a soft wash protects the parts of the roof that matter most.

6. Why a proper clean checks these areas

A good roof clean is also a chance to look closely at these forgotten spots. Someone up at the roof clearing moss can see whether the chimney mortar is sound, whether the flashing is sitting tight, and whether the ridge tiles are secure. That view from up top is something you never get from the ground.

It doesn't turn a clean into a repair job, but it does mean small problems get spotted while they're still small. On Durham's older roofs especially, that early warning is worth a lot, because a cracked flashing or a loose ridge tile caught now is a quick fix, while the same thing ignored becomes damp walls and a much bigger bill.

Joins fail first: Leaks start at the chimney, flashing, and ridge, not on the open tiles.
Chimney mortar: Cracked mortar and flaunching around the chimney let water straight in.
Flashing: The lead sealing the gaps corrodes and lifts, becoming a direct route inside.
Ridge tiles: Loose ridge tiles on failing mortar are both a leak and a wind-safety risk.
Moss at the joins: Growth traps damp against these weak points and speeds their decay.

Frequently Asked Questions

Where do most roof leaks actually start?
Usually at the joins rather than the open tiles. The chimney, flashing, and ridge are where water collects and materials wear, so they're the first places a roof tends to let water in.

What is flashing and why does it matter?
Flashing is the metal, often lead, that seals the gaps around chimneys, valleys, and wall joins. When it lifts or corrodes it becomes a direct path for water, so its condition is worth checking.

Can moss really damage the chimney and ridge?
Yes, because it packs into the mortar joints and holds damp against them. In a Durham winter that trapped water freezes and expands, prising at the mortar and speeding up the decay.

How would I know if my ridge tiles are loose?
You often can't from the ground, which is why a clean is useful. Someone up top can see whether the ridge tiles are secure and the mortar sound before one slips or blows off.

Do you check these areas during a roof clean?
A thorough clean includes a look at them. While clearing moss from the joins, it's easy to spot cracked mortar, lifted flashing, or a loose ridge tile so you can deal with it early.

Want the vulnerable parts of your roof kept clear and checked?
Ben's Roof Cleaning clears moss and cleans roofs and gutters with careful soft washing across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

The small joins protect the whole roof

It's easy to judge a roof by its broad slopes, but the chimney, flashing, and ridge are where it really earns its keep. These joins do the hardest work and fail first, and moss gathering in them quietly makes matters worse. Keep them clear and keep an eye on them during a clean, and you catch the small problems while they're cheap to fix, long before they turn into damp walls and a soaked ceiling.

How Often Should You Really Clean Your Roof?

Sun, 20 Sep 2026 14:45:00 GMT

You've probably wondered whether your roof needs cleaning yet, or whether you're leaving it too long. It's a fair question, and the honest answer is that there's no single number that fits every home. How often your roof needs attention depends on where it is, what it's made of, and what's growing on it.

That said, you're not left guessing entirely. There are clear patterns to how fast roofs green up, and Durham's damp climate pushes most homes toward the more frequent end of the scale. This guide gives you a realistic sense of timing, so you can keep on top of your roof without either neglecting it or cleaning it more than it needs.

The quick answer: Most roofs benefit from cleaning every two to four years, but shaded, tree-covered, or north-facing roofs in a damp area like Durham often need attention sooner, while a light biocide treatment in between stretches the gaps.

1. There's no one-size-fits-all answer

The frequency your roof needs cleaning comes down to its own situation. A roof in a sunny, open, breezy spot dries out quickly and grows moss slowly, so it can go longer between cleans. A shaded, damp roof under trees greens up fast and needs attention more often.

That's why any honest guide gives a range rather than a single figure. Two roofs on the same Durham street can be on very different schedules depending on which way they face and what's around them. The trick is learning to read your own roof rather than following a number that was never meant for your house.

2. What the Durham climate does to the timing

Durham's weather leans heavily toward more frequent cleaning. The damp air off the Wear valley, the steady rainfall, and the cool northeast climate keep roofs wet for much of the year, and that's exactly what moss and algae need. Roofs here green up faster than in the drier south.

It means the longer end of the usual guidance often doesn't apply locally. Where a roof in a dry region might stretch to four or five years, a comparable roof around Durham may want attention closer to every two or three. Factoring in the local climate is the single biggest adjustment you can make to your timing.

3. Trees, shade, and which way it faces

The area right around your roof changes everything. Overhanging trees drop leaves and cast shade, both of which keep the surface damp and feed growth, so a roof under mature trees needs cleaning more often than an exposed one. The leafy streets around Gilesgate and Neville's Cross are a good example.

Which way the roof faces matters just as much. North-facing slopes get the least sun, stay damp longest, and grow moss and algae fastest, so they often set the schedule for the whole roof. If your back slope faces north and sits under a tree, that's the part telling you when it's time.

4. Roof type and how it holds moss

Different roofs green up at different rates. Older, rougher, or more porous surfaces give moss and algae more to grip, while smoother modern tiles can be a little slower to colonise. The mix of slate and concrete tiles across Durham means schedules vary house to house.

The period slate roofs on Durham's older terraces have a texture that holds moisture, and their age can make them more welcoming to growth, so they often need a watchful eye. Whatever your roof is made of, knowing how it tends to behave helps you judge the gaps between cleans rather than waiting for it to look terrible.

5. The signs that say it's time now

Rather than counting years, it often helps to watch the roof itself. Visible green patches, dark streaks spreading, moss clumps in the gutters, or growth creeping up from the eaves are all signs the roof is asking for attention. If you can see it clearly from the street, it's overdue.

Gutters are a useful early warning. When you start finding lumps of moss washed down into them, the roof above is shedding growth, which tells you it's established up there. Catching these signs early means a lighter, cheaper clean than waiting until the whole slope has gone green.

6. Stretching the gaps with maintenance

You don't have to choose between frequent full cleans and letting the roof go. A biocide treatment applied after a clean keeps working for a long time, slowing regrowth so the roof stays clearer for longer and the next full clean is pushed further out. It's the middle path that suits Durham well.

Keeping gutters clear and trimming back overhanging branches helps too, since both reduce the damp and shade that speed up growth. In a climate this wet, a little ongoing care does more for your timing than any fixed schedule. Stay lightly on top of it and you avoid ever reaching the heavy, neglected state that forces a big clean.

Typical range: Every two to four years suits most roofs, but local conditions shift that a lot.
Damp climate: Durham's wet weather pushes most roofs toward the more frequent end.
Shade and trees: Overhung, tree-lined roofs green up fastest and need cleaning sooner.
North-facing slopes: The shadiest side grows moss quickest and often sets the schedule.
Watch the signs: Green patches and moss in the gutters mean it's time, whatever the calendar says.

Frequently Asked Questions

How often should I clean my roof in Durham?
Most roofs here suit cleaning every two to three years given the damp climate, though shaded or tree-covered roofs may need it sooner. Watching the roof for growth is more reliable than a fixed number.

Can I leave my roof longer if it looks fine?
Often yes, but check it properly rather than glancing. Growth usually starts on the shaded north slope and in the gutters, so a roof that looks clear from the front may still be greening up out of sight.

Does cleaning too often harm the roof?
With gentle soft washing there's little risk, but there's rarely a need to overdo it. A biocide treatment slows regrowth, so you can stretch the gaps rather than cleaning more frequently than the roof requires.

Why does my neighbour's roof stay cleaner than mine?
Usually it comes down to aspect and shade. If their roof faces the sun and yours sits under a tree or faces north, yours will green up faster and need cleaning more often despite being on the same street.

What's the best time of year to clean a roof?
There's no bad time, though many people sort it in spring or autumn. The key is not leaving heavy growth to sit through winter, when damp and frost let it dig in further.

Not sure if your roof is due a clean?
Ben's Roof Cleaning offers honest advice and gentle soft washing for roofs and gutters across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Read the roof, not just the calendar

How often to clean your roof isn't really a number, it's a habit of paying attention. Durham's damp climate, your trees, your roof's aspect, and what you find in the gutters all tell you more than any fixed schedule. Keep a light eye on it, treat it before the moss takes hold, and you'll clean it exactly when it needs it and no more. That's cheaper, kinder to the roof, and far less hassle than a rescue job.

Those Black Streaks on Your Roof: What the Algae Really Is

Tue, 15 Sep 2026 10:45:00 GMT

You've probably noticed those dark streaks running down your roof and assumed it's just dirt or staining. It isn't. Those black marks are alive, and knowing what they actually are changes how you deal with them. Scrubbing at dirt is one thing, but this needs a different approach entirely.

The good news is that the black streaking on your roof is a well-understood problem with a straightforward fix. It's not a sign your roof is falling apart, and it doesn't mean you need a new one. It does mean your roof has become home to something that spreads if left alone, so it's worth understanding before it takes over the whole slope.

The quick answer: Those black streaks are a hardy algae called Gloeocapsa magma, a living organism that feeds on your roof and spreads in damp, shaded conditions, and it's cleared with a soft wash and biocide rather than scrubbing.

1. It's algae, not dirt

The first thing to understand is that those streaks are a living algae, not grime that's built up over the years. It's a type known as Gloeocapsa magma, and it's remarkably tough. It settles on roofs, takes hold, and slowly darkens the surface as it grows and multiplies across the tiles.

Because it's alive, you can't just wash it off like mud. Blasting or scrubbing might shift the surface for a while, but the algae comes straight back because the organism itself is still there. That's why treating it properly means killing it, not just cleaning the visible marks away.

2. Why it streaks downward

Ever wondered why it runs in streaks rather than spreading evenly? The algae starts higher up and gets carried down the slope by rainwater, following the path the water takes. That's why the marks look like dark tears running from the ridge toward the gutters.

It often shows worst on north-facing slopes, which stay damp and shaded longest. On Durham roofs, where the sun is in short supply for much of the year and the damp lingers, those north sides give the algae exactly the conditions it wants. You'll frequently see one side of a roof streaked while the sunnier side stays clearer.

3. Why Durham roofs get it so badly

Algae loves moisture, and Durham provides plenty. The damp air that sits in the Wear valley, the regular rainfall, and the cool northeast climate keep roofs wet for long stretches, which is exactly what this organism needs to thrive. Drier parts of the country see far less of it.

Tree cover makes it worse. The mature trees around areas like Gilesgate and Neville's Cross throw shade and drop debris, both of which keep the roof damp and feed the algae. A roof tucked among trees near the valley floor will streak far faster than one out in the open catching wind and sun.

4. Is the algae actually harming the roof?

It's mostly a cosmetic problem to begin with, but it doesn't stay that way. As the algae holds moisture against the surface, it creates the damp conditions that moss and lichen love, so the black streaks are often the first stage before heavier growth moves in. Left long enough, that combination works on the roof surface itself.

On the concrete tiles common across Durham's newer estates, a long-term algae and moss covering can wear at the protective surface over the years. It's not an emergency, but it's not something to ignore forever either. Dealing with the streaks early stops the roof heading down that path.

5. Why scrubbing and blasting don't work

Reaching for a pressure washer feels logical, but it's the wrong tool for algae. High pressure might strip the visible streaks temporarily, but it damages tiles and slate, and the algae returns within a season because the spores are still there. You end up with a harmed roof and the same problem.

This matters on Durham's older slate roofs especially, where the surface is delicate and a blast can crack or dislodge tiles. The streaks look dramatic, but they don't call for dramatic force. A gentle treatment that kills the organism does far more than any amount of scrubbing, and it does it without the collateral damage.

6. How a soft wash clears it properly

The right fix is a soft wash. A low-pressure biocide treatment is applied to the roof, soaking into the algae and killing it at the source. Over the following weeks the dead algae breaks down and rain washes it away, leaving the roof clear without any harsh scrubbing.

The lasting benefit is that the biocide keeps working, so the streaks don't come racing back the way they would after a physical clean. In a climate as damp as the North East, that ongoing protection is what makes the difference between a roof that stays clear and one that's streaked again by next winter. It's the approach that actually suits the problem.

Living organism: The streaks are Gloeocapsa magma algae, not dirt, so they need killing rather than washing.
Water-borne spread: Rain carries the algae down the slope, creating those distinctive dark streaks.
Damp-driven: Durham's wet climate and shaded, tree-lined areas give the algae ideal conditions.
Gateway growth: Algae holds moisture that invites moss and lichen to follow.
Soft wash fix: A low-pressure biocide kills it at the root and keeps it from racing back.

Frequently Asked Questions

Are the black streaks on my roof dangerous?
Not immediately, but they shouldn't be ignored. The algae is cosmetic at first, yet it holds moisture that invites moss and lichen, which over time can wear at the roof surface.

Can I just scrub the streaks off?
Scrubbing or blasting only removes the visible marks temporarily and risks damaging the tiles. The algae returns because the organism is still there, which is why a biocide treatment is the proper fix.

Why is only one side of my roof streaked?
North-facing slopes stay damp and shaded longest, giving the algae ideal conditions. The sunnier, breezier side dries out faster and resists the growth, so it often stays clearer.

Will the streaks come back after cleaning?
Eventually some regrowth is natural in a damp climate, but a biocide treatment keeps working long after the visit, so a soft washed roof stays clear far longer than a scrubbed one.

Does every Durham roof get this algae?
Most are prone to it because of the damp climate, though shaded, tree-lined roofs near the valley get it worst. Roofs in open, breezy spots tend to streak more slowly.

Tired of the black streaks on your roof?
Ben's Roof Cleaning clears algae and moss with gentle soft washing across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Know your enemy and the streaks are easy to beat

Those black streaks aren't dirt and they aren't permanent, they're a living algae that thrives in Durham's damp and spreads if you leave it. Once you know that, the fix is obvious: kill the organism with a gentle biocide treatment rather than fighting the marks with force. Deal with it early and properly, and your roof stays clear through the wet seasons instead of streaking up again year after year.

What Happens During a Soft Wash, Step by Step

Fri, 11 Sep 2026 08:00:03 GMT

If you've booked a soft wash for your roof, or you're thinking about it, you probably want to know what you're actually paying for. It's fair to wonder, because from the ground it can look like someone spraying water about. There's more method to it than that, and knowing the steps helps you see why it works and why it lasts.

A soft wash isn't a blast-and-go job. It's a gentle, deliberate process built around killing moss and algae properly rather than just knocking the surface layer off. Here's what happens from start to finish when a roof gets soft washed, so you know what to expect on the day and afterwards.

The quick answer: A soft wash starts with an inspection, then debris is cleared, a low-pressure biocide treatment is applied to kill moss and algae at the root, and the treatment carries on working for weeks so the roof stays cleaner far longer than a quick scrub.

1. The first look and safe setup

Every job starts with a proper look at the roof. The cleaner checks the type of tile or slate, how much moss there is, the pitch, and whether any tiles are cracked or slipped. That assessment shapes how the rest of the work is done, because a delicate slate roof is treated differently to sturdy modern concrete.

Then comes safe access. On Durham's older terraces this can mean working around tight rear yards or reaching a steep pitch, so the right ladders, tower, or platform get set up before anyone goes near the roof. Getting this right at the start is what keeps the whole job safe and steady rather than rushed.

2. Clearing the loose debris first

Before any treatment goes on, the loose material is cleared away. Thick moss, fallen leaves, and general muck get removed gently so the biocide can reach the surface it needs to work on. Skipping this would leave the treatment sitting on top of debris instead of getting to the roots.

This is done carefully, not aggressively. The point is to lift the worst of the growth without scraping or hammering the tiles, which is exactly what separates soft washing from a pressure blast. On a roof under trees near the Wear valley, where leaf litter builds up fast, this clearing stage makes a real difference to the finish.

3. Applying the biocide treatment

Now the heart of the job. A biocide is applied at low pressure across the roof, soaking into the moss, algae, and lichen. Rather than forcing growth off with brute force, the treatment kills it at the root so it dies back and washes away naturally over the following weeks.

Low pressure is the key. It carries the treatment onto and into the surface without driving water under tiles or stripping the finish, which matters enormously on the Welsh and Scottish slate you find across Durham's period homes. The roof is left coated with a treatment that keeps doing its job long after the cleaner has packed up.

4. Letting the treatment do the slow work

Here's the part that surprises people. A soft washed roof often doesn't look perfect the moment the work finishes. The biocide needs time to kill the growth fully, and over the following weeks the dead moss and algae dry out, break down, and get washed off by the rain.

That gradual change is a good sign, not a fault. In Durham's regular rainfall the roof steadily clears itself as the weeks pass, ending up far cleaner than a same-day scrub could ever leave it. Patience here is rewarded with a result that actually lasts through the seasons.

5. Sorting the gutters and downpipes

Cleaning a roof pushes debris downward, so the gutters get attention as part of a thorough job. Dead moss and muck that comes off the roof can end up in the gutters, and clearing them stops blockages and keeps rainwater draining properly away from the walls.

On Durham's terraces, where gutters often run the length of a shared row, a blocked section can send water spilling down the brickwork and cause damp inside. Dealing with the gutters at the same visit means the whole rainwater system is left working as it should, not just the roof looking better.

6. The lasting protection afterwards

The big advantage of soft washing shows up in the months that follow. Because the biocide keeps working, the roof stays clear far longer than it would after a physical clean alone. You're not back to square one by the next wet season.

Given how damp the North East stays year round, that lasting protection is worth a lot. Moss will always try to return on a shaded roof near the river, but a treated surface resists it for much longer, which means fewer cleans over the years and better value from each one. A little maintenance keeps that protection topped up.

Inspection first: The roof is assessed for tile type, moss level, and any damage before work begins.
Debris cleared: Loose moss and leaves are removed gently so the biocide can reach the surface.
Low-pressure biocide: The treatment kills moss and algae at the root without harming slate or tiles.
Gradual result: The roof keeps clearing over weeks as rain washes off the dead growth.
Gutters included: Debris pushed down during cleaning is cleared so drainage stays free.

Frequently Asked Questions

Why doesn't my roof look clean straight away?
Soft washing works over time. The biocide kills the moss and algae, then the rain washes the dead growth off gradually over the following weeks, so the roof keeps improving after the visit.

Is low pressure really enough to clean a roof?
Yes, because the biocide does the actual killing, not the water. Low pressure carries the treatment safely without the risk of driving water under tiles or stripping the surface.

Will soft washing damage my slate roof?
No, that's the point of it. The gentle, low-pressure method suits the delicate slate common on Durham's period homes far better than any high-pressure approach.

Do you clean the gutters as well?
A thorough job includes them, since cleaning the roof pushes debris down. Clearing the gutters keeps rainwater draining properly and protects the walls from damp.

How long before I see the full result?
Usually a few weeks, depending on rainfall. Durham's regular rain helps wash the dead growth away steadily, and the roof ends up cleaner than a same-day scrub could manage.

Ready to see what a proper soft wash can do?
Ben's Roof Cleaning uses gentle, low-pressure soft washing for roofs and gutters across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Gentle work that keeps on working

A soft wash is a steady, careful process rather than a quick blast, and that's exactly why it protects your roof and lasts. From the first inspection to the biocide that carries on killing growth for weeks, every step is aimed at a clean that holds up through Durham's wet months. Knowing what happens on the day makes it easy to see why the gentle approach beats the fast one every time.

What Roof Cleaning Actually Costs and What Drives the Price

Mon, 07 Sep 2026 09:45:00 GMT

If you've searched for roof cleaning prices, you've probably found numbers all over the place and come away none the wiser. That's frustrating when all you want is a rough idea of what to budget. The honest truth is that no two roofs cost the same to clean, because the job depends on things that vary house to house.

What you can do is understand what actually moves the price up or down. Once you know that, a quote stops feeling like a random figure and starts making sense, and you can tell a fair one from a rip-off. This guide walks through the real factors behind the cost of a roof clean, with Durham homes in mind, so you know what a cleaner is looking at when they work out your number.

The quick answer: Roof cleaning cost is driven mostly by the size and pitch of the roof, how easy it is to reach safely, how bad the moss is, the number of storeys, and whether you add gutter cleaning or treat it as a one-off versus ongoing maintenance.

1. The size of the roof

Size is the starting point for any quote. A bigger roof has more surface to treat, takes longer, and uses more material, so it costs more than a small one. That much is obvious, but it's why a detached house with a sprawling roof will always sit above a compact mid-terrace.

Durham's housing mix shows this clearly. A narrow two-up two-down in one of the older terraces near the city has far less roof than a modern detached place out on the newer estates around Belmont. When you compare quotes, keep the size of your own roof in mind rather than what a neighbour with a different house paid.

2. The pitch and how easy it is to walk

How steep your roof is changes the job a lot. A steep pitch is harder and slower to work on safely, and that extra care and time feeds into the price. The steep Victorian pitches you see on Durham's older terraces are a different proposition to a gentle modern slope.

The type of surface matters too. Delicate slate or older tiles need a gentler, more careful approach than robust modern concrete, and that can affect how long the work takes. A cleaner isn't just measuring the area, they're weighing up how the roof itself will handle the job.

3. Access and how safely they can reach it

Access is one of the biggest hidden factors. A roof that's easy to reach from a drive or garden is quicker and cheaper to clean than one hemmed in by extensions, conservatories, or a narrow back lane. If scaffolding or a tower is needed to work safely, that adds to the cost.

The tight terraced streets around parts of Durham can make access genuinely awkward, with limited room to set up and shared rear yards to negotiate. A back roof over a cramped yard takes more effort to reach than a front slope facing an open road. None of this is padding, it's the real work involved in doing the job safely.

4. How much moss and growth there is

A lightly greened roof is a quicker job than one buried under thick, established moss. Heavy growth takes more treatment and more time to clear properly, and if it's been left for years the mats can be dense and stubborn. The worse the state, the more work it is to bring back.

Durham's damp climate means moss builds up faster here than in drier regions, especially on shaded north-facing slopes and roofs under trees near the Wear valley. A roof that's been ignored through several wet winters will cost more to sort than one caught early, which is a good argument for not leaving it too long.

5. Storeys, gutters, and the extras

The number of storeys affects both safety and access, so a tall three-storey terrace generally costs more to clean than a low bungalow. Working higher up takes more setup and more care, and that's reflected in the price. Height is one of the clearer factors you can weigh up yourself.

Adding gutter cleaning changes the figure too, and it often makes sense to do both at once while the access is already set up. Gutter length and how blocked they are both play in. Bundling jobs on the same visit is usually better value than booking each separately, so it's worth asking what a combined price looks like.

6. One-off clean or ongoing maintenance

A single deep clean of a badly neglected roof is a different cost to a lighter maintenance visit on a roof that's kept in check. The first clean of a roof left for years is the heavy one. After that, keeping on top of it is quicker and easier each time.

Because the North East stays so damp, a maintenance approach with the odd biocide treatment often works out better value over time than waiting for the roof to get bad again and paying for another full clean. It spreads the effort and keeps the roof from ever reaching the state that costs the most to fix. Think of it as steady upkeep rather than occasional rescue.

Roof size: More area means more time and material, so bigger roofs cost more to clean.
Pitch and surface: Steep slopes and delicate slate need more care, which affects the price.
Access: Awkward reach, shared yards, or scaffolding needs all push the cost up.
Moss severity: Thick, long-neglected growth is far more work than a light greening.
Extras and frequency: Gutters, storeys, and one-off versus maintenance all shift the final figure.

Frequently Asked Questions

Why won't anyone give me a price over the phone?
Because a fair quote depends on your specific roof. Size, pitch, access, and how bad the moss is all vary, so a proper cleaner needs to see the roof before committing to a figure.

Is a bigger roof always more expensive?
Generally yes, since there's more surface to treat and more time involved. That said, a small but steep or hard-to-reach roof can cost more than a large easy one, so size isn't the only thing.

Does heavy moss really cost more to remove?
It does. Thick, established growth takes more treatment and more time to clear than a light greening, which is why catching it early usually works out cheaper in the long run.

Should I get the gutters done at the same time?
Often it's worth it. With access already set up, doing gutters alongside the roof tends to be better value than booking a separate visit later on.

Is a maintenance plan cheaper than one-off cleans?
Over time it often is. Regular lighter visits stop the roof reaching the neglected state that costs the most to put right, especially in a damp climate like Durham's.

Want a straight, no-pressure quote for your roof?
Ben's Roof Cleaning provides honest roof and gutter cleaning with proper soft washing across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Every roof is priced on its own merits

There's no single price tag on roof cleaning because there's no single roof. Size, pitch, access, moss, height, and how you look after it afterwards all feed into the figure, which is why a proper cleaner wants to see the job before quoting. Understand those drivers and you can judge whether a quote is fair for your home. The one thing that reliably costs more is leaving it, so a roof caught early is a roof cleaned cheaply.

Roof Cleaning and Your Home's Kerb Appeal

Sat, 05 Sep 2026 11:00:00 GMT

Stand across the road from your house for a minute and really look at it. Your eye goes to the roof more than you'd think, and if it's streaked with black or gone green with moss, that's the first thing anyone else notices too. A tired roof can make a perfectly good home look neglected before a visitor has even reached the gate.

Kerb appeal isn't just estate agent talk. It's the impression your home gives from the street, and it shapes what people assume about the whole property. You can have a smart door and tidy windows, but a filthy roof undoes a lot of that in one glance. The good news is that cleaning a roof is one of the cheaper ways to sharpen up how your home looks from the front.

The quick answer: A clean roof lifts your home's kerb appeal by removing the black streaks and green moss that make a house look run down, and it signals to buyers and neighbours that the property has been looked after.

1. The roof is a bigger part of the view than you think

On a lot of Durham homes the roof takes up a huge slice of what you see from the pavement. The steep pitches on the older terraces and the long roof lines on the semis mean the tiles or slate are front and centre, not tucked out of sight. When that surface is clean, the whole house reads as cared for.

When it's green and streaky, the opposite happens. The eye snags on the mess, and the rest of the house suffers by association. Fresh paintwork and a tidy garden can't quite make up for a roof that looks like it hasn't been touched in a decade. Cleaning it brings the biggest single surface of your home back into line with everything else.

2. What moss and streaks say to a passer-by

Green patches and dark streaks send a message whether you mean them to or not. To most people they read as neglect, and neglect on the outside makes them wonder what's been ignored inside. That's an unfair leap in plenty of cases, but it's how buyers and neighbours instinctively judge a place.

Durham's damp climate means roofs here green up faster than in drier parts of the country, so a mossy roof is common but still noticed. Around the older streets near the city and the estates out in Belmont, a clean roof genuinely stands out on a terrace where others have let theirs go. That contrast works in your favour.

3. Selling up: the roof and the first photo

If you're putting your home on the market, the roof matters more than ever. The main listing photo is usually the front of the house, and a green or streaky roof is right there in the shot putting people off before they've read a word. Plenty of buyers scroll past on the strength of that first image alone.

A clean roof also heads off awkward questions during viewings. Moss and streaks invite buyers to worry about the condition underneath, even when the roof is sound, and that doubt can knock money off an offer. For homes around Neville's Cross and Gilesgate where family buyers are looking closely, a roof that photographs well and reassures in person is worth the modest cost of cleaning it.

4. Cleaning versus replacing: a cheap win

People sometimes assume a grim-looking roof needs replacing, which is a big, disruptive expense. Very often it doesn't. The tiles or slate underneath are perfectly sound, and it's only the moss, algae, and streaking on the surface making it look far worse than it is. A clean brings back the finish without touching the structure.

Set against the cost of a new roof, cleaning is a small outlay for a large visual gain. On Durham's period stone terraces especially, where original slate can last generations, cleaning preserves the character of the roof rather than swapping it for something that never quite matches. You keep the look the house was built with and simply bring it back to life.

5. Keeping the lift once you've got it

A clean roof doesn't stay clean on its own, but keeping it looking sharp is easier than the first clean. A biocide treatment carries on working after the visit, slowing the return of moss and algae so the fresh look holds for far longer than a quick scrape would manage. That's the difference between a one-off and a lasting result.

Keeping gutters clear and cutting back overhanging branches helps too, since both feed the damp and shade that moss thrives on. In a climate as consistently wet as the North East, a little upkeep goes a long way. Stay on top of it and your roof keeps pulling its weight in how the whole house presents, year after year.

6. It's not only about selling

Kerb appeal matters even if you've no plans to move. There's a quiet satisfaction in pulling up to a home that looks well kept, and a clean roof is a big part of that first impression every single day. You notice it, and so does everyone who visits.

There's a neighbourly side as well. On a tight Durham terrace where the roofs run together in one long line, one clean roof lifts the look of the whole row, and a green one drags it down. Taking care of your own patch is part of taking pride in the street, and it tends to be contagious once one house sets the standard.

Biggest surface: The roof is often the largest thing you see from the street, so its condition sets the tone.
First impressions: Moss and streaks read as neglect, fairly or not, to buyers and passers-by alike.
Listing photos: A clean roof in the main photo keeps buyers scrolling instead of clicking away.
Clean, don't replace: A sound roof usually just needs cleaning, not the huge cost of replacement.
Lasting look: A biocide treatment and clear gutters hold the fresh appearance through Durham's damp.

Frequently Asked Questions

Does a clean roof really help sell a house?
It genuinely can. The front of the house is usually the main listing photo, and a clean roof makes that image far more inviting while heading off condition worries during viewings.

Will cleaning make my old roof look new?
It won't turn back the clock entirely, but it makes a striking difference. Removing moss and streaks brings the true colour of the tiles or slate back and takes years off how the roof appears.

Is it worth cleaning the roof if I'm not moving?
Many people think so. A well-kept roof improves how your home looks every day and lifts the whole street on a terrace, quite apart from any future sale.

How long will the improved look last?
With a biocide treatment and clear gutters, the fresh appearance holds for a good while. Durham's damp does bring moss back eventually, but far more slowly than an untreated roof.

Can a dirty roof lower my home's value?
It can dent the impression buyers form, which affects offers. A roof that looks neglected raises doubts about the property, even when the structure underneath is perfectly sound.

Want your home to look its best from the street?
Ben's Roof Cleaning restores tired, mossy roofs with careful soft washing across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

A clean roof changes the whole picture

Your roof does more for the look of your home than almost anything else you can see from the street, and letting it go green quietly undermines everything else you've done. Cleaning it is a small job with an outsized payoff, whether you're selling, staying, or just tired of the state of it. Give the biggest surface on your house the attention it deserves and the rest of the place looks better for it straight away.

How to Choose a Roof Cleaner and Avoid the Cowboys

Tue, 01 Sep 2026 13:00:01 GMT

If someone's knocked on your door offering to clean your roof for cash today, your guard should already be up. Roof cleaning is one of those jobs where it's hard to tell good work from bad until months later, and that gap is exactly where the cowboys operate. You hand over money, they blast the roof, and the damage doesn't show until the next hard Durham winter.

The good news is that a proper firm gives itself away just as clearly as a dodgy one, if you know what to listen for. You don't need to be an expert on tiles or biocides to ask the right questions. This guide walks through the signs that tell you who's worth trusting on your roof and who to send packing before they get near a ladder.

The quick answer: Choose a roof cleaner who soft washes rather than pressure blasts, carries proper insurance, works from safe access, gives you a written quote, and has real local reviews, and avoid anyone doing cold-call doorstep sales who wants cash up front.

1. Why dodgy roof cleaners keep turning up

Roof cleaning has a low barrier to entry. Anyone can buy a pressure washer, load a van, and start knocking on doors, and plenty do. Because the results look impressive the same day, a bad job can pass for a good one right up until the tiles start letting water in, and by then the van is long gone.

Durham gives these operators plenty of targets. Damp air off the Wear valley keeps roofs mossy across the whole area, so there's no shortage of green roofs to point at. When someone tells you your roof looks terrible and they can sort it this afternoon, that urgency is the sales pitch, not a genuine assessment of your home.

2. Check they soft wash, not just blast away

The single most important question is how they'll actually clean the roof. A good firm soft washes, using low-pressure water and a biocide treatment that kills moss and algae at the root without hammering the tiles. A cowboy reaches straight for a pressure washer because it's fast and it looks dramatic.

High pressure strips the protective surface off concrete tiles and can crack or dislodge older slate, which matters a lot on Durham's period stone terraces and slate roofs. If someone can't explain why soft washing protects your roof, or waves the question away, that tells you they either don't know or don't care. Both are reasons to say no.

3. Ask about insurance and how they reach the roof

Working at height is where roof cleaning gets genuinely risky, for the worker and for you. A proper firm carries public liability insurance and can tell you plainly how they'll access your roof, whether that's ladders, a tower, or a platform. A cowboy dodges the insurance question and improvises access on the day.

This matters more on the taller three-storey terraces you see around the city and in older parts of Durham, where a fall or a dropped tile onto the street below is a serious business. If an accident happens on your property and the person isn't insured, you do not want to be finding that out afterwards. Ask early, and ask directly.

4. Watch for pressure selling and cash-only jobs

The doorstep cold call is the classic cowboy move. They happen to be working in the area, they've spotted your roof, and there's a special price if you say yes right now. Real firms don't operate like that. They quote, they let you think, and they don't panic if you want to check them out first.

Cash up front with no paperwork is another warning sign. On estates around Belmont and Framwellgate Moor these knock-and-go outfits tend to work a street at a time, moving on before anyone notices the job wasn't what was promised. If you feel rushed or pushed, that feeling is worth trusting. Take their details and look them up before you commit to anything.

5. Get the job in writing before it starts

A written quote protects everyone. It should spell out what's being cleaned, the method, whether gutters are included, and what the price covers. When it's all verbal, it's your word against theirs if the moss is back in a month or a gutter got missed entirely.

A clear quote also stops the price creeping up halfway through. Some outfits start low to win the job, then find reasons to add on once they're up the ladder. If a firm is happy to put the details in writing and answer questions about them, that's a firm that expects to stand behind its work rather than disappear after the invoice.

6. Local knowledge and a real reputation

A cleaner who knows Durham roofs knows what they're dealing with. The mix of Welsh and Scottish slate on the older terraces, the concrete tiles on the newer estates around Gilesgate and Neville's Cross, and the damp that never quite lifts off the valley floor all change how a roof should be treated. Local experience shows in the questions they ask about your home.

Reputation is the other half of it. Look for reviews from real addresses nearby, ask neighbours who they've used, and be wary of anyone with no traceable history at all. A firm that's worked in the area for years and wants to keep working here has every reason to do the job properly. A passing van does not.

Method matters: Insist on soft washing over pressure blasting to protect slate and concrete tiles alike.
Insurance: Public liability cover is non-negotiable for anyone working at height on your home.
No doorstep rush: Cold calls with a today-only price are the oldest trick in the trade.
Written quote: Get the method, scope, and price on paper before any work begins.
Local track record: Real Durham reviews and a settled reputation beat a nameless van every time.

Frequently Asked Questions

Should I ever accept a doorstep roof cleaning offer?
It's best not to. Genuine firms rarely cold-call with a price that only stands if you agree on the spot, so treat that pressure as a reason to close the door and find someone yourself.

How do I know if a roof cleaner is insured?
Just ask to see their public liability cover. A proper firm will happily confirm it, while anyone who gets evasive or changes the subject is telling you something you need to hear.

Is pressure washing ever the right choice for a roof?
Rarely, and not on delicate tiles or slate. Soft washing clears moss and algae without stripping or cracking the surface, which is why it suits the older roofs common across Durham.

Why do cowboys prefer cash and no paperwork?
Because it leaves no trail. Without a written quote or receipt there's nothing to hold them to if the work fails, which is exactly why a reputable cleaner offers both without being asked.

What questions should I ask before hiring?
Ask how they'll clean it, whether they're insured, how they'll reach the roof, and whether they'll put it in writing. Clear, confident answers to all four are a good sign.

Want a roof cleaner you can actually trust?
Ben's Roof Cleaning offers honest, insured roof and gutter cleaning with proper soft washing across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

A few questions save you a lot of grief

Choosing a roof cleaner really comes down to slowing down and asking a handful of straight questions. How will you clean it, are you insured, how will you get up there, and will you put it in writing. The cowboys fall apart under that gentle scrutiny, while a proper local firm answers without blinking. Take the extra day to check, and you'll spare yourself the far bigger cost of putting a botched job right later.

Cleaning Moss Off a Flat or Low-Pitch Roof

Sat, 29 Aug 2026 15:00:01 GMT

If your flat or low-pitch roof has slowly turned green over the last couple of winters, you're not imagining it and you're not alone. Shallow roofs hold water and stay in shade far longer than a steep pitched roof, and around Durham that damp, slow-drying surface is exactly what moss and algae want. You'll usually spot it first on a garage roof, a kitchen extension, or a dormer that never seems to fully dry out.

The trouble is that a flat roof hides its problems better than a pitched one. You can't see it from the pavement, so the moss builds up quietly until water starts sitting in green puddles or a damp patch appears on the ceiling below. By then the covering has often been working harder than it should for a while. This guide walks through why it happens on low roofs specifically, what the moss actually does to the surface, and how to get it off without wrecking the covering in the process.

The quick answer: A flat or low-pitch roof is cleaned with a gentle soft wash, not a pressure washer, because low-pressure water and a biocide treatment lift moss and kill the spores without splitting the felt, membrane, or seams that keep the roof watertight.

1. Why low roofs collect moss in the first place

Water is the whole story. A steep roof sheds rain in seconds, but a flat or low-pitch roof lets it linger, and a surface that stays wet is a surface moss can colonise. Add the damp air that rolls up the Wear valley and the long grey spells Durham gets from autumn through to spring, and you've got near-perfect growing conditions for months on end.

Shade makes it worse. A lot of these roofs sit low behind taller houses or under the mature trees you find across Gilesgate and Neville's Cross, so the sun barely touches them. Leaf litter drops onto the surface, breaks down into a thin layer of muck, and gives moss spores somewhere to root. Once that mat takes hold it acts like a sponge and keeps the covering wetter still.

2. The damage moss does when water cannot drain away

On a pitched roof moss is mostly a surface nuisance. On a flat roof it's more serious, because a thick green mat dams up the little bit of fall the roof relies on to drain. Water pools behind it, and standing water is the enemy of every flat roof covering, whether that's old felt, a rubber membrane, or a fibreglass finish.

That trapped moisture works into seams, laps, and around outlets, and in a Durham winter it freezes overnight and thaws by day again and again. That freeze-thaw cycle prises materials apart over time. Plenty of the 1970s and 1980s extensions on estates around Belmont and Framwellgate Moor have flat felt roofs that fail early for exactly this reason, and a mossed-up surface speeds the whole thing along.

3. Why blasting it with a pressure washer is a mistake

It's tempting to point a pressure washer at a green flat roof and watch it come clean in minutes. Please don't. High-pressure water finds every seam, lap, and worn patch on a low roof and drives straight underneath, and on felt or a membrane you can lift edges or tear the surface without realising until it leaks.

There's the safety side too. Flat and low-pitch roofs feel walkable, so people climb straight onto them, but a wet mossy surface is slick and the covering may be softer than it looks. A garage or single-storey extension roof over a hard yard is still a real fall. This is a job that pays to approach gently and, for anything you're unsure of, from a proper platform rather than by scrambling up.

4. How a soft wash actually clears a low-pitch roof

Soft washing does the same job without the risk. The surface gets treated with a low-pressure water and biocide mix that soaks into the moss and kills it down to the spore, so instead of scrubbing living growth off a delicate covering, you're letting the treatment do the work chemically. Loose material is cleared gently and the outlets are checked so water can run away freely again.

The other advantage is how long it lasts. Because the biocide keeps working after the visit, the surface stays clear for far longer than a quick physical scrape would give you. On a shaded low roof in a damp spot like the valley floor near the river, that lasting protection matters more than it would on a bright, breezy pitched roof that dries itself out.

5. Clearing the gutters and outlets that feed the problem

A flat roof drains through outlets and into gutters, and those are usually where the real bottleneck sits. If a rainwater outlet is packed with moss and silt, the water has nowhere to go and simply sits on the roof, feeding the very growth you're trying to get rid of. Clearing the roof without clearing its drainage only fixes half the job.

On the older terraces around Durham, low rear extensions often drain into a shared or awkwardly routed gutter that's easy to forget about. Getting those outlets and gutter runs flowing again is part of the same visit, so the surface can actually shed water the way it was built to. A dry roof grows far less moss than a wet one, and it's the drainage that keeps it dry.

6. Keeping a flat roof cleaner through the wet months

Once a low roof is clean, the goal is to slow down how fast it greens up again. Keeping overhanging branches trimmed back helps, because less shade and less leaf litter means less for moss to feed on. Clearing debris off the surface a couple of times a year, especially after autumn leaf fall, stops that thin organic layer building back up.

A periodic biocide treatment keeps the surface hostile to regrowth without anyone needing to climb up and scrub. Given how consistently damp the North East gets, a light maintenance approach beats waiting until the roof is thick with moss again. It's cheaper over time and far kinder to the covering than repeated heavy cleans on a surface that was never meant to take a battering.

Standing water: The main enemy of any flat roof, and moss makes it worse by damming natural drainage.
Gentle method: Soft washing lifts moss with low pressure and biocide instead of blasting fragile felt or membrane.
Drainage first: Blocked outlets and gutters keep the surface wet and feed regrowth, so they get cleared too.
Shade and leaves: Trees around Gilesgate and Neville's Cross drop litter that helps moss root, so trimming back pays off.
Little and often: Light maintenance suits the damp North East better than occasional heavy cleans.

Frequently Asked Questions

Can you walk on a flat roof to clean it?
Only with real care, and often it's safer not to. A wet mossy surface is slippery and some coverings are softer than they look, so where possible the work is done from a platform or the edge rather than by loading the middle of the roof.

Will pressure washing ruin my flat roof?
It can, and often does. High-pressure water gets under seams and laps and can tear or lift felt and membranes, which is why a low-pressure soft wash is the safer choice on any flat or low-pitch covering.

How often should a low-pitch roof be cleaned in Durham?
It depends on shade and tree cover, but many damp, shaded roofs benefit from attention every couple of years. A roof under trees near the river will green up faster than one out in the open.

Does moss really cause leaks on a flat roof?
Indirectly, yes. Moss traps water and dams drainage, and that standing water works into seams and freezes in winter, which is what damages the covering and eventually lets water in.

Is a garage or extension roof worth cleaning?
It usually is. These low roofs green up quickly because they sit in shade, and keeping them clear protects the covering and the room or space underneath from damp problems later.

Is your flat or garage roof turning green?
Ben's Roof Cleaning clears moss safely from flat and low-pitch roofs with gentle soft washing across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

A clean low roof is a dry low roof

Flat and low-pitch roofs live or die by how well they drain, and moss is the thing that quietly stops them doing it. Clear the growth gently, keep the outlets and gutters flowing, and stay ahead of it with the odd light treatment, and a low roof will shrug off Durham's wet winters for years. Leave it green and holding water, and you're just waiting for the leak. A careful clean now is the cheap end of that choice.

Getting Your Durham Roof Ready for Winter

Sat, 22 Aug 2026 18:05:53 GMT

Winter is when your roof gets tested. The cold drives in off the Pennines, the rain settles in for days, and hard frosts freeze everything solid overnight. If there's a weak spot up there, this is the season that finds it, usually at the worst moment.

The good news is a little work in autumn saves a lot of grief later. You don't need to be a roofer to get your Durham home ready. Here's what to sort before the weather turns, and why each job earns its place.

The quick answer: Clear the gutters, deal with any moss, check for slipped slates, and make sure water can drain freely before winter arrives. A roof that starts the cold season clean and clear handles Durham's frost and rain far better than one that's already clogged.

1. Clear the gutters once the leaves are down

Autumn drops a whole season of leaves and loosened moss into your gutters, and Durham's wooded riverbanks and mature street trees pile it on. By deep winter that lot has packed into a soggy, solid dam.

A blocked gutter in December is real trouble. Rain overflows and pours down the walls, and if it freezes it expands and can split the gutter itself. Clear them in autumn, once most leaves are down, and the water has a free run all winter. It's the single most useful job here.

2. Get the moss off before the frosts arrive

Moss and cold are a poor mix, and Durham gets plenty of hard frosts. Thick moss holds water against the slates, and when that water freezes it expands, working at the edges and prying them loose. Over a Durham winter, one freeze after another, that's how a small crack becomes a real one.

A soft wash in early autumn clears the moss and treats the surface before the first frost. The roof goes into winter dry and clear rather than wearing a wet green blanket through every cold night.

3. Check for slipped or missing slates

On a calm day, look over the roof from the ground with binoculars. You're after slates that have slipped out of line, gaps where one's gone missing, or anything sitting at an odd angle.

A single missing slate is a small job in October and a big one in January, once water's been getting through the gap for months. Durham's winter winds will find any loose slate and finish the job, so it pays to spot them while the weather still lets you fix them.

4. Look over the flashings and ridge mortar

The lead flashing around the chimney and the mortar along the ridge are common weak points on older Durham homes. Cracked mortar and lifted flashing let water in, and winter tests them harder than any other time.

From the ground you can often spot the obvious faults: a strip of flashing flapping, or gaps opening along the ridge line. These are jobs for a roofer, but knowing they're there before winter means you can get them fixed while conditions still allow.

5. Make sure the loft is dry and breathing

Your loft is an early warning system. Before winter, check it on a dry day for damp patches, staining or a musty smell, and make sure the vents aren't blocked by insulation or debris.

Good airflow up there keeps condensation down and the timbers dry. A damp loft heading into winter only gets worse as the cold deepens. Sorting the ventilation and spotting leaks now beats dealing with a soaked ceiling in the new year.

6. Book the work early, not mid-storm

Everyone rings a roofer after the first big blow, which is exactly when they're hardest to get hold of. The smart move is to have the cleaning and any small repairs done in autumn, ahead of the rush.

Here's a simple autumn checklist to work through:

Gutters cleared of leaves and moss, water draining freely.
Moss treated and cleared off the slates before the frosts.
Slates checked for slips, gaps and damage.
Flashings and ridge mortar looked over for cracks and lifting.
Loft inspected for damp, leaks and blocked vents.

Frequently Asked Questions

When's the best time to get my roof ready for winter?
Early to mid autumn, once most leaves are down but before the first frosts. That clears the debris and beats the storm-season rush for tradespeople.

Do I really need to clear the gutters every year?
In Durham, usually yes, especially near trees. One autumn clear-out prevents most winter overflow and damp problems. It's cheap insurance.

Can moss really damage my roof in winter?
Yes. It traps water that freezes and expands in the cold, working at the edges of slates. Clearing it beforehand avoids that freeze-thaw damage.

Is it safe to check my own roof?
Checking from the ground with binoculars is fine and useful. Climbing a ladder onto a wet or icy roof is not. Leave the height work to someone equipped for it.

What if I find a problem too late in the year?
Get it looked at anyway. A temporary fix can hold through winter until a proper repair is possible. Ignoring it lets a small leak do months of damage.

Want your roof sorted before the storms?
Ben's Roof Cleaning cleans roofs and clears gutters across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

A little autumn effort buys a dry winter

Durham winters aren't gentle with a neglected roof. The rain keeps coming, the cold off the Pennines is sharp, and a hard freeze turns trapped water into a wedge. But a roof that goes into the season clean, clear and checked over takes it all in its stride. Spend an afternoon on the checklist this autumn, or get someone in to do it, and you'll spend the winter thinking about anything but your roof. That's exactly how it should be.

7 Signs Your Durham Roof Is Overdue a Clean

Sat, 22 Aug 2026 18:05:51 GMT

Your roof gets on with its job quietly, out of sight, until the day it doesn't. The good news is it nearly always warns you first. Spot the signs and you can fix a small problem before it becomes a big, wet, costly one.

In a damp river city like Durham, those warnings turn up sooner and matter more. Here are seven signs your roof is asking for a clean, and why each one is worth a second look.

The quick answer: Green or black patches, streaks down the slates, moss piling in the gutters, water overflowing in the rain, grit washing from the downpipe, a musty loft, and a roof that simply looks tired all point to a clean being overdue. Deal with them early and they cost far less.

1. Green patches creeping across the slates

The clearest sign, and the one everyone spots. Moss shows first on the shaded, north-facing slope, then spreads from a faint green haze into thick, spongy cushions.

Durham's damp air lets it move quickly. A roof that looked fine last spring can be visibly green by autumn. Once you can make out the moss from the pavement, it's well settled in and worth dealing with before it thickens further.

2. Dark streaks running down from the ridge

Those grey-black lines running down a roof aren't dirt or a trick of the light. They're algae, thriving in the same damp that feeds the moss.

Streaks are more than an eyesore. They keep moisture on the slates and usually travel with moss you haven't noticed yet. A streaky roof is a roof staying wetter than it should, and a soft wash clears both the algae and the moss together.

3. Moss and muck piling up in the gutters

Next time it pours, look at what's sitting in the gutter and washing from the downpipe. Clumps of moss, grit and rotted leaves collecting up there tell you the roof above is shedding its growth.

The wooded riverbanks and the leafy streets around Neville's Cross make it worse, leaves piling on top of the moss. A gutter packed with debris can't drain, and that's the moment water starts heading somewhere it shouldn't.

4. Water spilling over the gutters

If rain sheets over the front of the gutter instead of running to the downpipe, something's blocking the flow. Usually it's moss and silt washed down off the roof.

This one matters because the overflow runs straight down your walls. On stone or brick that soaks the wall through, and over a Durham winter that means damp working its way inside. An overflowing gutter is your roof telling you the moss has reached the drainage.

5. Grit or granules in the downpipe

On concrete-tiled roofs, common on Durham's interwar and postwar homes, watch for a sandy grit gathering at the foot of the downpipe or on the ground below. That grit is the tile's protective coating wearing away.

Moss and algae speed the breakdown by holding damp against the surface. Once the coating's gone, the tiles age faster and soak up more water. Cleaning the roof and clearing the growth slows the whole thing down.

6. A damp, musty smell in the loft

Put your head into the loft on a dry day and take a breath. A musty, earthy smell, or damp showing on the timbers, means moisture is getting in where it shouldn't.

A blocked, moss-heavy roof and clogged gutters are a common reason. Water that can't drain finds its way under slates and into the roof space. Catching that smell early, before it becomes a stained ceiling, can spare you a serious repair bill.

7. A roof that just looks worn out

Sometimes there's no single alarm, just a roof gone dull, dark and patchy next to how it used to look. Trust that read. A neglected-looking roof usually is one.

Here's a quick way to judge it without leaving the ground:

Compare it to the neighbours. If yours is clearly greener or darker, moss has the upper hand.
Look after rain. A roof that stays dark and wet-looking long after the sun's out is holding moisture.
Check the shaded slope. That's where trouble always starts, so it's the honest test.
Glance at the gutter line. A green fringe there means moss is already on the move.

Frequently Asked Questions

How often should a Durham roof be cleaned?
It depends on shade and trees, but many roofs here do well with a clean every few years. A damp, shaded roof under trees may need it sooner.

Can I check these signs without going up on the roof?
Yes. Most are visible from the ground or with binoculars, and you can check the gutters and loft too. Leave the actual roof access to someone equipped for it.

Is a little moss really worth cleaning off?
A light amount isn't urgent, but it rarely stays light in Durham's climate. Cleaning while it's minor is cheaper than waiting for blocked gutters and damp.

Will a clean deal with the streaks too?
Yes. A soft wash clears algae streaks along with the moss and treats the surface so both are slower to return.

What if I just leave it?
Moss thickens, gutters block, walls get damp, and slates wear faster. A cosmetic problem turns into a repair. Acting early is far cheaper.

Recognise a few of these on your roof?
Ben's Roof Cleaning cleans roofs and gutters across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Catch it early and the roof stays cheap to keep

On their own, none of these signs spell disaster. Together they mean the damp is slowly getting the better of your roof, and every year you leave it the bill climbs. A roof caught early needs a simple clean. A roof left for years needs that plus new gutters, damp repairs, sometimes slates. Give yours a proper look this month. Future you will be glad you did.

Caring for Period and Slate Roofs in Durham

Sat, 22 Aug 2026 18:05:48 GMT

Durham takes its old buildings seriously. The cathedral and castle have stood on the peninsula for the best part of a thousand years, and the Victorian terraces that spread out around the city have kept families dry for well over a hundred. Your own roof deserves the same respect, whether it's stone, brick or a period slate terrace.

The catch is that an older roof needs the right sort of care. Handle it roughly and you can undo a hundred years of good service in a single afternoon. Here's what makes Durham's period roofs special, and how to keep yours sound.

The quick answer: Slate is tough but brittle, and it splits along natural layers. Clean it gently with a soft wash, never a pressure washer, keep the gutters clear so water drains off the walls, and check for slipped slates after storms. Cared for properly, a Durham slate roof outlasts its owners.

1. What sits on Durham's rooftops

Durham grew as a cathedral and market city, then expanded with the railways and the great County Durham coalfield around it. The terraces that housed the workers went up in stone and brick, and above them went slate.

Most of that slate has done its job for generations. Grey slate over stone is the classic Durham roof, from the streets below the cathedral to the old pit villages that ring the city. Much of it is still the original roof, quietly keeping the rain out just as it always has.

2. What makes slate different from a modern tile

Slate isn't made in a factory, it's split from natural rock. That gives it a lifespan modern concrete tiles struggle to match, but it also brings a particular weakness. Slate cleaves along flat layers, and an old slate thinned by age can snap or flake if it's handled roughly.

Then there are the fixings. Each slate hangs on a couple of nails, and over a century those nails rust away. It's called nail sickness, and it's why old roofs start dropping slates in strong winds even when the slate itself is sound. Caring for a slate roof means caring for the whole system, not just the surface you can see.

3. Cleaning an old roof without harming it

This is where good intentions go wrong. A pressure washer strips moss off slate fast, but it also forces water up under the slates, works loose the tired old nails, and cracks the thinner pieces. On a roof that's lasted a century, that's a steep price for a quick clean.

Soft washing is the safe route. Low-pressure water and a biocide clear the moss and algae and kill the growth at the root, with no force that could split a slate or drive water inside. The roof comes up clean, and just as important, it comes through the clean undamaged.

4. Keeping water off the walls below

Much of Durham's older housing is stone or brick, and neither enjoys being soaked over and over. That makes your gutters more important than they look. When moss washes off the slates and blocks them, water spills over and runs straight down the wall.

Do that winter after winter and the stone or brick stays wet, which invites damp inside and slowly wears the pointing and the face of the wall. Clearing the gutters is humble work, but on a period home it protects the walls as much as the roof. Keep the water running where it should and the whole house stays drier.

5. Spotting trouble early on a period roof

Old roofs give you fair warning if you know the signs. A quick look from the ground with binoculars after a big blow can save you a much larger bill. Keep watch for these:

Slipped or missing slates, often the first hint of nail sickness setting in.
A slate or two in the garden after a windy night.
A dip or sag in the roof line, which can point to tired timbers below.
Heavy moss on the shaded slope, holding damp against the slate.
Staining on upstairs ceilings, a sign water is getting past the roof.

6. When to clean and when to call a roofer

Cleaning and repair are two different jobs, and it helps to know which you need. A roof that's sound but green wants a soft wash and a gutter clear. A roof dropping slates or letting water in needs a roofer to put the structure right first.

Often the sensible order is to have the roof cleaned so it can be seen clearly, then sort any repairs the clean brings to light. A good clean makes slipped slates and worn patches far easier to spot. There's no sense treating moss on a roof about to be reslated, and no sense reslating a roof whose only fault is years of neglected moss.

Frequently Asked Questions

How long does a slate roof in Durham actually last?
The slate itself can last well over a hundred years. The nails and battens holding it up wear out sooner, which usually triggers major work rather than the slate failing.

Can I pressure wash my slate roof if I'm gentle?
Better not to. Even careful pressure washing can crack thin old slates and force water underneath. Soft washing gets the same result without the risk.

Is moss really damaging my slate, or just sitting on it?
Over time it holds damp against the slate and can lift edges in a freeze. It also washes into gutters and blocks them, which threatens the walls below. Worth removing.

My roof drops a slate every winter. Why?
That's usually nail sickness, where century-old fixing nails have rusted through. A roofer can refix or replace them. It's common on Durham's older terraces.

Should I clean the roof before I sell?
It usually helps. A clean slate roof looks cared for and reassures buyers, and it lets any real issues be seen and sorted rather than flagged in a survey.

Got a period roof that needs a careful hand?
Ben's Roof Cleaning cleans and maintains slate roofs across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Old slate rewards the owner who respects it

There's something to admire in a roof that's kept a family dry since before anyone can remember. Durham's slate earned its name the hard way, over generations of northeast weather sitting on solid stone. Clean it gently, keep the water running off it and away from the walls, and fix the small faults before they grow. Do that and your period roof carries on with its quiet work long after you've passed the house along.

Why Durham Roofs Grow So Much Moss

Sat, 22 Aug 2026 18:05:46 GMT

Look up at your roof after a run of grey, damp days and the green is hard to miss. A haze across the slates, thick pads on the shaded slope, dark streaks heading for the gutter. If your Durham roof seems to green up faster than you'd expect, there's a solid reason behind it.

Set in a tight loop of the River Wear, ringed by wooded banks and open to the cool, wet weather that rolls off the Pennines, Durham gives moss plenty to work with. Here's why the stuff loves your roof, what it does over the years, and how to actually keep it under control.

The quick answer: Moss needs moisture, shade and a surface it can grip, and Durham supplies all three. Damp air off the Wear, shade from the city's wooded valley and mature trees, and a cool northern climate keep roofs wet for days. Killing the growth at the root with a soft wash is what keeps it away.

1. A damp river city is exactly what moss wants

Moss asks for one thing above all: steady moisture. Durham sits low in the Wear valley, and the river, the steep wooded banks and the cool northeast air keep the damp hanging around long after the rain stops.

Roofs here don't dry out fast. They hold moisture for days, and that lingering damp is the exact window a moss spore needs to root and spread. It's why a Durham roof can turn noticeably green in a single season while a drier, sunnier spot keeps its slates clear for years.

2. The shaded slope always goes first

Sun dries a roof and holds moss back. Shade does the reverse. The north-facing slope of your house stays damp longest, and that's nearly always where the green shows first and grows thickest.

Durham has shade to spare. The wooded riverbanks, the mature trees around Wharton Park and the leafy streets of Neville's Cross all throw shadow across nearby roofs and drop debris that keeps the slates wet. If one side of your roof is green and the other clear, watch where the sun actually falls across the day. The pattern usually explains itself.

3. Old, weathered slate gives moss its grip

A smooth new tile sheds water and gives spores little to hold. Old slate is a different story. Decades of weather leave the surface pitted and open, and every little hollow traps water and grit.

Durham has plenty of aged roofs. The Victorian slate on the terraces of Gilesgate, Crossgate and the old pit villages around the city has weathered for a century or more, and that rough old surface is a perfect anchor for moss. The slate hasn't failed. Time has simply made it grippier than the day it first went up.

4. What moss actually costs you over time

A thin green film won't bring the house down. Leave it for years, though, and moss causes real trouble, building quietly until one day it doesn't.

It holds water against the slates rather than letting it drain, and that constant damp wears the surface faster. In a hard northern frost the trapped water freezes, expands, and can lift or crack a slate. Clumps break loose and slide into the gutters, blocking them, so rain spills down the walls instead of draining. Keep an eye out for these:

Green or black patches spreading over the slates, worst on the shaded slope.
Moss in the gutters or scattered on the ground after wind and rain.
Gutters spilling over in heavy rain when they used to cope.
Dark streaks running down from the ridge, a sign of algae riding along with the moss.
Damp marks on upstairs ceilings, where trapped water has worked its way in.

5. Why a quick brush never really works

Plenty of people take a stiff brush to the moss on a dry day. It feels productive and the roof looks better for a bit. But brushing only lifts the top growth. The roots and spores stay behind, and a few damp months later the green is back.

And there's a real risk in it. Scraping hard at old slate can loosen or crack it, and a wet, sloping roof is a dangerous perch. Clearing the surface is half the job at best. The half that lasts is treating what's left behind.

6. What genuinely keeps a Durham roof clear

The method that works is a soft wash. Loose moss is cleared gently, then the whole roof gets a biocide that kills the growth to the root and keeps working for months.

Because it deals with the cause rather than just the look, the roof stays clean far longer than any brush-off manages. In a damp river city like Durham, that treatment step is the difference between cleaning the roof once every few years and fighting the same moss every spring.

Frequently Asked Questions

Is moss on my roof a real problem or just an eyesore?
Both. A little is mostly cosmetic, but left for years it traps damp, blocks gutters and can crack slates in a freeze. Sorting it early is cheaper.

Why is only one side of my roof green?
Shade. The north-facing slope stays wet longest, so moss grows there first and thickest. The sunny side dries and stays clearer.

Will the moss come back after cleaning?
If you only brush it, yes, fast. A proper soft wash with a biocide kills the root and keeps it away for years in most cases.

Does Durham's weather really make that much difference?
It does. The river valley, the shade and the cool northern climate keep roofs damp far more of the year than you'd think, and that steady moisture is exactly what moss needs.

How quickly should I act on moss I've noticed?
No need to rush, but don't leave it for years. A clean before it clogs the gutters or hits a freeze-thaw cycle saves money later.

Tired of moss taking over your roof?
Ben's Roof Cleaning clears and treats mossy roofs across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

You can't dry out the Wear valley, but you can beat the moss

The damp that keeps Durham's riverbanks green is the same damp that keeps your roof under pressure, and none of us can move the weather. What you can change is how long moss gets to sit up there doing its slow work. Clear it, treat it at the root, and keep half an eye on that shaded slope where it always begins. Do that and your roof handles the northern damp the way it was built to, year after year.

Soft Washing vs Pressure Washing a Durham Roof

Sat, 22 Aug 2026 18:05:43 GMT

The moss has crept across your roof and you want it dealt with. Fair enough. Before you let anyone at it with a pressure washer, though, it's worth knowing that the fastest-looking method is often the one that does a Durham roof the most harm, especially the old slate that sits over so many homes here.

Two approaches do the job, and they work in completely different ways. One forces the growth off. The other kills it and lets it fall away on its own. Here's how they compare, and why the gentle one suits the slate and stone homes you find right across Durham.

The quick answer: Soft washing uses low-pressure water and a biocide to kill moss and algae at the root without harming the roof. Pressure washing blasts it off by force, which can crack slate, strip tile coatings and drive water underneath. For most Durham homes, soft washing is safer and keeps the roof cleaner for far longer.

1. What a pressure washer really does to your slate

Aim a pressure washer at a mossy roof and it comes up clean in minutes. That's the pull. The harm is the part you don't notice until months later.

Every slate and tile has a weathered outer skin that helps it shed rain. A high-pressure jet scours that skin away, leaving the surface rougher and more open than it was. Rough surfaces hold water and dirt, so the moss returns thicker and faster. On Durham's older roofs the risk climbs. A hard jet can split an aged slate, knock it loose, or force water up under the laps and into the roof space. One clean summer, then a worn roof for good.

2. How soft washing gets there without the damage

Soft washing takes the opposite path. Rather than forcing the growth off, you kill it where it sits.

A gentle, low-pressure spray carries a biocide across the whole roof, and that solution kills the moss, algae and lichen down to the root. Over the following weeks the dead growth loosens and rinses away in the rain. Nothing is scoured, nothing is driven under the slates, and the treatment keeps working after the job is done. It takes a little patience, and it pays you back in years of a cleaner roof.

3. Why Durham's slate roofs need a careful hand

Durham is a city of old buildings, from the cathedral peninsula out to the Victorian terraces of Gilesgate, Crossgate and Neville's Cross. Many of those terraces still wear their original slate, laid a century or more ago over stone and brick.

Slate is split from natural rock, so it's tough but it cleaves along flat layers, and an old slate thinned by decades of northeast weather is brittle. A pressure jet has no mercy for brittle. Soft washing clears the moss without risking a single slate. On roofs that have already lasted longer than any of us, that care only makes sense.

4. What the job looks like on a Durham home

A proper soft wash starts with a look at the roof, the gutters and how to reach it all safely. Terraces and older homes often mean access front and back, and a wet slate roof is no place to hurry, especially on Durham's steep, hilly streets.

Loose moss is cleared gently first so the biocide can reach the surface. Then the whole roof is treated with the low-pressure spray, and the gutters are usually cleared at the same time, since that's where the loosened moss ends up. No roaring engine, no green slurry running down the street. Just a steady, careful job that leaves the roof improving for weeks afterward.

5. The method that actually lasts

Here's the real difference between the two. Pressure washing only removes what's on the roof that day. The spores stay put, the surface is left rougher, and in Durham's damp northern air the green is soon back.

Soft washing kills the growth at the root and leaves a treated surface behind, so a properly done roof stays clean for years rather than months. Once you add up how often you'd repeat a pressure wash, the gentle method wins on cost as much as on safety.

6. What to ask before anyone climbs a ladder

Not everyone offering roof cleaning does it the same way. A few straight questions tell a careful firm from a risky one:

Which method do you use? If it's pressure washing on old slate, ask why and how they'll protect it.
Do you treat as well as clean? The biocide step is what stops the moss returning straight away.
Are the gutters included? Loosened moss has to go somewhere, and it's usually the gutter.
Do you know Durham roofs? Local know-how with terrace access and older slate beats a general jet-wash outfit.
Can I have the quote in writing? A clear price with the method spelled out saves any argument later.

Frequently Asked Questions

Will my roof look clean the same day as a soft wash?
Not fully. The biocide needs a few weeks to kill the growth, then rain rinses the dead moss away. The roof keeps improving well after the visit.

Is pressure washing ever the right tool?
On a patio or a concrete drive, yes. On a roof, and especially old Durham slate, it does more harm than good.

Will the biocide harm my garden?
A careful operator covers or rinses nearby plants and mixes the solution correctly. Mention any prized borders before the work begins.

How long before the moss returns?
After a proper soft wash, many Durham roofs go several years before they need doing again. A shaded roof under trees may need it sooner.

Could I just do it myself?
Clearing a little gutter is fine. Working across a wet, sloping slate roof is genuinely dangerous, and getting the treatment right takes some knowing. Most people are better leaving it to someone set up for the job.

Want your roof cleaned the safe way?
Ben's Roof Cleaning looks after roofs, moss and gutters across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Gentle is the right call on a Durham roof

Blasting a roof clean feels like real progress, but it swaps a good-looking summer for a shorter roof life and moss that keeps returning. Soft washing takes longer to show its full result and leaves your slate exactly as sound as it found it. In a city that has looked after its old buildings for centuries, treating your roof with the same care is the obvious choice.

The Importance of Roof Washing & Gutter Cleaning for Sussex Homes

chaim.berko@duda.co (Haim Tom Berko) — Fri, 28 Nov 2025 04:57:00 GMT

Clean Your Roof, Protect Your Home

Let's face it - none of us look at our roofs very often, and gutters are usually the last thing on our minds.

We've all got busy lives, and your roof and gutters are those sorts of things where if there isn't a pressing emergency you really don't tend to think about it.

But I've learned the hard way what ignoring gutters, or allowing moss to build up on my roof (one eventually resulted in the other), can do to your home. So how do you clean moss off roof?

Renter's and Landlords

Before I was a homeowner I was a renter with a private landlord. My landlord was a lovely gentleman, but he lived abroad and as long as I kept him up to date on anything going on with the house he was fairly happy for me to take the reins.

I'd noticed moss dropping onto our conservatory roof pretty much every day. Once every few months I'd get out there with a ladder and sweep it off, or I'd hope for a heavy rainfall to wash it away, but I had no idea that all that moss was falling straight into our gutters.

Fast forward to six months later and we had blocked downpipes, an external wall with a massive damp patch, and a downstairs loo that smelled of mildew no matter what we did.

In coordination with our landlord we had Ben's Gutters come and clean out the gutters and wash the conservatory roof, but because I hadn't noticed the warning signs, we had to get builders out to sort out the damp patch which no one was pleased about, I can tell you.

What can you do to protect your home from damp?

Regular roof maintenance is one of those things we don't think about - if it ain't broke and all that. But Sussex homeowners quickly learn that addressing minor issues today can save significant costs and prevent potentially dangerous complications down the road.

Here's what you need to look out for:

Moss build up: if there's moss falling of your roof it's likely pulling off pieces of your tile with it.
Overflowing or leaking gutters: Gutters are vital for making sure that rainwater is properly carried away from your home. If they're leaking or overflowing, best to get them sorted out quickly.
Algae, lichen and discolouration of your tiles: Roof tiles can discolour for a number of reasons. Algae is an organic breeding ground for more plant life, while pollution can leave unsightly streaks and dark patches. Roof cleaning can handle that - a little work and a lot of reward!

What do we recommend?

Routine Inspections: Identifying damaged shingles, gutter blockages, or visible wear early.
Preventative Measures: Simple fixes that extend your roof’s service life.
Seasonal Tips: Preparing your home for varying weather conditions to minimize risks.

By taking proactive steps, you’ll not only preserve the aesthetic appeal of your property but also enhance its structural integrity and market value.

Combatting Roof Damage Before It Starts

Moss is the biggest cause of cracked and damaged tiles. When you call Ben's Roof Cleaning or Ben's Gutters to come and work on your home we'll do a full inspection and let you know what's going on up there, which is particularly helpful when you can't see the signs for yourself!

Roof washing is one of those tasks which might take a day or two, but the results last for years, plus we aim to clean your roof without disruption to your life and leave your home looking in tip top condition so minimum effort on your part for maximum reward.

While regular gutter cleaning can prevent cracked, sagging and blocked gutters, a roof clean can prevent cracked tiles, clogged gutters and leaky roofs, all things that compromise the structure of your home if left untended.

Tip: Getting your gutters cleaned and your roof inspected in early spring and late autumn can help maintain roof longevity in the Sussex climate.

Top 7 Challenges for Roof Maintenance in Sussex Homes

Unpredictable Weather Trends:- Sussex is known for its rapid weather shifts. Heavy downpours and sudden gusts can weaken roofing materials, making routine maintenance crucial to spot issues before they escalate.
Elevated Humidity Levels:- The coastal influence increases humidity, which can encourage moss and algae growth. This not only stains the roof but also accelerates material degradation if not addressed regularly.
Salt Air Exposure:- Homes near the sea experience the corrosive effects of salt-laden winds. Over time, this exposure can erode metal fixtures and compromise the integrity of roofing components.
Temperature Fluctuations:- Frequent shifts between hot and cold conditions cause materials to expand and contract. This natural cycle can lead to cracks and gaps requiring careful monitoring and timely repairs.
Localized Wind Patterns:- Sussex’s unique geography creates wind tunnels in certain areas. High winds may lift loose shingles or expose underlying structures, underscoring the need for secure installations.
Seasonal Debris Accumulation:- Fallen leaves and branches accumulate more during autumn and winter. Regular clearing prevents blockages and avoids damage from excess moisture retention.
Aging Roof Infrastructure:- Many Sussex homes have older roofs built with materials that may not withstand modern weather extremes. Proactive inspections can help extend the life of these historic structures.

TIP: We don't recommend roof cleaning if your roof is older than 50+ years or has extreme moss build up. At the point where you can't see the tiles under the moss, you'll have to get in a builder as most of those tiles may have become brittle and will crack when cleaned. If you can address your roof before it gets to this level, the better it will be for you and your home.

Frequently Asked Questions

Q. Can roof cleaning prevent costly repairs?

A. Yes, regular cleaning removes debris, algae, and lichen that can deteriorate roofing materials over time. A clean roof performs better, reducing long-term maintenance expenses.

Q. What are the signs that my roof needs repair?

A. Look out for missing shingles, water stains on ceilings, or visible cracks. Such issues may indicate worn-out sealants or structural weaknesses and means you might need a builder or specialist roofer. Ben's Roof Cleaning here in Sussex will clean roofs usually up to 50+ years old provided that you can still see tile beneath the moss.

Q. Are there any season-specific maintenance tips for Sussex, United Kingdom homes?

A. In Sussex, United Kingdom, autumn leaves, winter moisture, and summer heat all affect roofing integrity. Seasonal check-ups by our friendly gutter cleaners can adjust cleaning methods to suit these conditions.

In conclusion:

Roof cleaning can save you from long-term issues in your home.
Our gutter cleaners at Ben's Gutters can alert you to any problems or concerns when carrying out routine gutter cleaning on your property.
If you have any questions about our services or the cost, contact us on the link below.

Clean roof today, a better tomorrow for your home in Sussex

5 Top reasons why Roof Washing is absolutely worth it

chaim.berko@duda.co (Haim Tom Berko) — Thu, 27 Nov 2025 05:20:34 GMT

How to clean moss off roof

Have you ever searched for roof cleaning near me? As a homeowner you might have noticed your tiles looking a little worse for wear. Maybe you've got moss falling off your roof in chunks and blocking your gutters or even landing on your conservatory roof.

Over the years, and thanks to the UK's generally damp and humid weather, we have the perfect climate for moss to grow and thrive, particularly on our roofs.

One of the easiest and most effective ways to handle it is to get your roof cleaned, and there are at least 5 main benefits that you might not know!

1. Roof washing immediately makes your home look younger.

Curb appeal may not be the first thing on your mind, but your home looks fresher with a clean roof. Your tiles might have once been a lovely terracotta colour, or even warm ochre or slate, but all of that is hidden under years of build up from algae, moss and even bird droppings.

Cleaning your roof costs a fraction of the price of new roof tiles and immediately gives your home a boost of its appearance.

2. Roof cleaning protects your tiles and your home from long-term damage

Moss is a silent menace. During the warmer months moss spreads and grows, burying its roots deep within the cracks of your tiles. In the winter months these roots freeze and contract, which can lead to moss falling off and pulling pieces of your tile with it!

Left for a long period of time this can even prevent the ability for you to clean your roof altogether, as scrubbing or pressure washing your tiles might cause too much damage, so it's better to tackle it before it gets really bad.

We give quotes over the phone by looking at your property online. If you have areas of concern or want to highlight anything on your property you can send us some quick photos by Whatsapp or email, and we'll give you a quote over the phone usually within 30 minutes of contacting us.

Once we've got you booked in we'll send our fully insured cleaners out to your property and complete the work usually within 1-2 days (depending on the size of your home). You don't need to be in the whole time so long as we can set up and carry on with the work, and we'll do full before and after pictures and a report of the work so you can get on with your day.

It's easy, convenient and entirely hassle-free.

If you'd like to get a completely free, no-obligation quote over the phone or by text or email, just contact us today and we'll get right back to you!

5. It's safer, easier and faster than you think to book in roof cleaning

3. Roof cleaning improves the energy efficiency of your home

A thick layer of moss and algae acts like a soaked sponge on your roof—it holds water, reduces insulation efficiency, and can even contribute to ice dams in cold snaps. A clean roof sheds rainwater faster, reduces damp risk in the loft, and lets your insulation do its job properly—so your heating bills thank you too.

We've been gutter cleaning for over 15 years, so we know what blocked gutters full of moss look like! Moss falls into your gutter, gets washed into your downpipe and, if you don't do regular gutter maintenance, can cause everything from damp patches on your walls to cracked foundations. This makes roof cleaning far more important than you might at first think.