If you remove moss from the roof then you will reduce the possibility of tiles suffering from winter cracks.
Moss on roof tiles damage.
However the greatest benefit of moss removal is on the gutters.
Moss absorbs and retains water.
Moss damages your shingles in three significant ways.
Once moss is removed there are less blockages and your gutters work more efficiently.
Second moss absorbs water.
Moss alone cannot damage the tiles.
Moss on roof tiles can cause multiple problems such as wood rotting and the obstruction of drainage points.
Without any protection your shingles will warp and crack in the sun significantly shortening their lifespan.
If you are to use a power washer you have to make sure you are standing on top of the roof and pointing the power washer downwards.
If high pressure water is aimed near any damaged or missing roof tiles you will end up causing more damage than the moss ever did.
Ultimately moss growth on a roof can result in costly repairs and can also reduce the lifespan of your roof.
If you allow large patches of moss to grow on your roof these patches hold water against the surface of the roof which can cause the roofing materials to rot.