How to remove moss from a roof without damaging it
Removing moss from a roof comes down to three jobs: getting the growth off the tiles without harming them, getting the debris out of the gutters, and dealing with the spores so it does not come straight back. Skip any one of those and the roof either gets damaged or turns green again within a season or two.
This guide walks through how moss removal should be done, which shortcuts cause problems and how to decide whether to tackle it yourself or book a professional.
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Do you need to remove moss from your roof?
A light dusting of moss on a sound roof is mostly cosmetic. Thick cushions are a different matter. They hold water against the tiles, lift the edges of tiles as they grow, and wash into the gutters where they cause blockages and overflow. Moss in valleys and along ridges is the most important to deal with, because that is where water needs to flow freely.
If moss is spilling over the gutters, sitting in clumps on the drive after rain or covering most of a slope, it is worth removing.
How to get rid of moss on a roof: the method
- Look first: check the roof from the ground or with photographs for cracked, slipped or missing tiles.
- Scrape by hand: work down the roof, lifting moss out of the gaps and off the tile faces with hand tools.
- Bag the debris: collect what comes off rather than sweeping it into the garden.
- Clear the gutters and downpipes: most of the moss ends up in them during the work.
- Treat the spores: apply a biocide at low pressure so regrowth is slowed.
What not to do
Do not pressure wash. It strips the surface of concrete and clay tiles, drives water up under the laps and can wash out ridge and verge mortar. A tile that has been blasted is rougher and holds more water, which gives the next crop of moss a better place to grow.
Do not pour household bleach or strong chemicals over the roof. Run-off ends up on plants, lawns and in drains, and a bleach wash alone will not lift thick moss. Products marketed for roofs need to be used as directed and are a treatment step, not a replacement for removing the growth.
Can I remove moss from my roof myself?
On a single-storey extension or garage roof you can reach safely from proper access, removing a little moss by hand is possible. On a house roof, the honest answer is that the risk is in the height, not the moss. Mossy tiles are slippery even when dry, a ladder on soft ground can move, and walking on tiles in the wrong place can crack them.
Our separate guide on DIY moss removal risks goes into those dangers in more detail. If you do want to try, never work alone, never lean a ladder on a gutter and never step onto a fragile roof such as a conservatory or sheeted garage.
How professionals remove moss buildup
Our moss removal is done by hand. Moss is lifted from tile faces, joints, valleys and the ridge, bagged and taken away. The gutters and downpipes are cleared of everything that falls, and the roof is finished with a low-pressure biocide wash. We never pressure wash roofs. Full roof cleans come with our written 24-month biocide guarantee.
Because we are on the roof close up, we photograph its condition and show you anything worth knowing, such as a slipped tile or a loose ridge, before we leave.
Keeping moss off afterwards
Moss returns fastest on shaded, damp slopes. Cutting back overhanging branches, keeping gutters clear and having the roof treated rather than only scraped all help a clean roof stay that way for longer.
Our own photographs
Images from Sky Scrapers Ltd work showing the methods described on this page.
Where this applies locally
Towns where this comes up most often on our patch:
Want a professional to handle it?
Rather leave the roof to us?
Send a few photographs from the garden and we will tell you how heavy the moss is and what removing it would involve. Quotes are free and carry no obligation.
Sky Scrapers Ltd · info@sky-scrapers.co.uk
Questions we get asked
Is it good to remove moss from a roof?
Yes, where it is thick. Heavy moss holds water against the tiles, lifts tile edges and blocks gutters. It should be removed by hand rather than pressure washed, then treated.
How do you remove moss on roof tiles?
Lift it off by hand with scraping tools, working down the roof, then clear the gutters and apply a biocide at low pressure to deal with the spores left in the tiles.
How do you remove moss on a roof safely?
From proper access, never working alone and never stepping on fragile roofs. On most house roofs the safest option is an insured team used to working at height.
How do you remove moss growth on a roof so it stays off?
Remove the visible moss, then treat the roof with a biocide so the spores and roots left behind are killed. Keeping gutters clear and trimming overhanging trees helps too.
Can I use a pressure washer to remove roof moss?
We would not recommend it. High pressure damages the tile surface and can force water into the roof. We never pressure wash roofs.
In short
Remove moss by hand, bag it, clear the gutters and treat the spores. Avoid pressure washers and bleach, and leave house roofs to an insured team if the height is the risk.
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