Moss on a roof rarely needs removing unless it's blocking the gutters, outlets or other places the rain drains away. The time to act is when it gets thick between the tiles.
Tiles have a rough face, so they catch the dirt that rain washes down, and leaves add to it. That's what moss grows in. Once it's there it soaks up water like a sponge, so the tiles under it stay damp long after the rain stops. When it gets thick between the tiles, it can block the channels the water runs down and let rain through to the layer underneath.
A mossy roof also means the gutters below need clearing more often. Try not to go up and look yourself, as walking on a roof can crack tiles, and hairline cracks can go unnoticed and get worse in winter. Moss treatments aren't a permanent fix either, so a mossy roof needs regular checks.
Dealing with it before the channels block keeps rain from reaching the layer under the tiles. If you've spotted thick moss building up between your tiles, get in touch with Stratford Roofing. I'll come out and assess it first as part of our Roof Repairs.
