If you are worried about this it may just be best to go ahead and remove the moss.
Is moss damaging to roofs.
The danger of moss lies in its ability to retain moisture.
Moss itself is harmless.
Furthermore moss likes to grow on cement and can agitate the bond between ridge apex tiles and your roof.
If you remove moss from the roof then you will reduce the possibility of tiles suffering from winter cracks.
Moss alone cannot damage the tiles.
Once moss is removed there are less blockages and your gutters work more efficiently.
Moss readily grows on roof shingles especially in the spaces between shingles where the spores collect.
As i mentioned before moss typically grows in the cracks between each shingle.
Moss is different from algae lichen or mold fungi which are typically easier to clean and less damaging to a roof.
A small amount of moss is harmless but if it s left untreated it can cause significant damage and degrade the structural integrity of your roof.
You should also consider that moss retains a great deal of moisture which may have a damaging effect to the roofs structure.
A lot of care should be taken when removing moss because cleaning a roof could prove just as damaging to it than leaving the moss on it.
It does not produce any dangerous spores or fumes it contains no poisons or irritants and it lacks the mass to physically damage any structures including roof shingles.
However the greatest benefit of moss removal is on the gutters.
Moss absorbs and retains water.
Left unattended moss can spread and cause all kinds of damage.