Furthermore moss likes to grow on cement and can agitate the bond between ridge apex tiles and your roof.
Moss on roof tiles damage.
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.
Second moss absorbs water.
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.
However the greatest benefit of moss removal is on the gutters.
Moss on roof tiles can cause multiple problems such as wood rotting and the obstruction of drainage points.
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.
Without any protection your shingles will warp and crack in the sun significantly shortening their lifespan.
Moss absorbs and retains water.
Moss alone cannot damage the tiles.
First moss will strip away the protective oils on your shingles making them susceptible to erosion and sun damage.
In addition the water trapped by the moss pools in gaps between your roof s tiles and as that water freezes and thaws it can pull the tiles apart causing even more damage.
If you remove moss from the roof then you will reduce the possibility of tiles suffering from winter cracks.