Is moss on my roof a problem?
A light covering of moss is not damaging your roof, but a thick growth is: it holds water against the tiles, slows the run-off into the gutters and, when it slides off, blocks them. The NFRC's guidance says heavy moss that affects drainage should be carefully removed, by scraping rather than pressure washing. We clear it by hand from boards, clear the gutters, and can fit copper strip to slow regrowth.
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