Roof Cleaning & Moss Removal
Roof Cleaning & Moss Removal Done Without Damaging Your Tiles
Moss holds moisture against your tiles and can shorten their life if left untreated. We clear it safely, without the aggressive pressure-washing that damages roofs.
- Fully insured tradespeople
- 10-year workmanship guarantee
- Rapid emergency response
- Locally based in Welwyn
Signs you need this service
- Visible green or dark moss growth across tiles, especially on north-facing slopes
- Small clumps of moss or granules collecting in the gutter
- Tiles that look consistently damp even in dry weather
- A roof that looks noticeably darker or greener than neighbouring properties
- Moss growth that has been left untreated for several years
Our process
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1
Assess coverage
We check how widespread the moss growth is and whether any tiles have already been damaged underneath it.
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2
Safe manual removal
Moss is removed by hand and low-pressure methods — we don't use aggressive jet-washing, which can strip the protective granules off tiles and shorten their life.
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3
Treat to slow regrowth
Where appropriate, we apply a biocide treatment to slow moss and algae regrowth.
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4
Clear gutters
Dislodged moss and debris is cleared from gutters as part of the same visit so it doesn't cause a blockage.
Why choose CS Roofing
- Manual, low-pressure removal — never aggressive jet-washing that damages tiles
- Gutters cleared as part of the same visit
- Treatment applied to slow regrowth, not just a one-off clean
- Fully insured for safe working at height
Frequently asked questions
Does moss actually damage roof tiles?
Yes, over time — moss holds moisture against the tile surface, which can accelerate frost damage and shorten tile lifespan, particularly on concrete tiles.
Is pressure washing safe for roof cleaning?
We avoid aggressive pressure washing because it can strip the protective granule coating off tiles and force water under them. We use manual removal and low-pressure methods instead.
How often does a roof need moss removal?
It depends heavily on aspect and surrounding trees — shaded, north-facing roofs near trees may need attention every 2-3 years, while others go much longer.
Will moss removal fix a leak?
Moss removal is a maintenance service rather than a leak repair — but heavy moss can sometimes contribute to water tracking under tiles, so it's worth mentioning any leak symptoms when you book so we can check while we're up there.