Moss on your roof: when it matters and what to do

When moss is a problem

Moss holds moisture against the roof surface. In frost, that moisture freezes and expands, which can crack tiles and loosen slates over time.

The more immediate issue is usually the gutters. Moss breaks off, washes down and blocks gutters and downpipes, sending water down walls instead of away from the house.

Heavy moss can also hide the condition of the roof underneath, making problems harder to spot.

What not to do

Pressure washing a roof can force water under the slates and strip the surface of tiles. Walking on the roof to scrape it can break slates and is unsafe without the right access equipment.

The sensible approach

Moss removal done properly means clearing it by hand or with suitable tools, clearing the gutters afterwards, and checking the roof while it is clean. We can advise on whether your roof would benefit and whether a coating is suitable — quotations are free.