What moss does
It holds water against the tiles, adds weight and, as it grows into the laps, lifts tiles and slates enough to let wind-driven rain underneath.
Where it ends up
In the gutters. Clumps wash down in heavy rain and block gutters and downpipes, which then overflow.
When to remove it
- Moss is thick enough to bridge between tiles
- Gutters block repeatedly
- Tiles are being lifted or dislodged
How it should be done
By hand, with scrapers and brushes, working down the roof. A biocide applied afterwards slows regrowth.
Why not pressure washing
A high-pressure jet strips the surface from concrete and clay tiles, shortens their life and forces water up under the laps and into the roof.
Keeping it away
Cutting back overhanging branches lets the roof dry out, which is the best long-term defence.
Need this fixed?
See our Roof Cleaning
service in Prestwich, or ask for a free quote.