Keep your trees well trimmed to lessen the debris that falls onto your rooftop.
Moss on roof tiles is it a problem.
Roof moss prevention if the above sounds like too much of a hassle which honestly it likely does then know that the most effective method is to prevent the problem of moss on your roof in the first place.
Shaded areas exposed to frequent damp cool weather will quickly encourage moss to grow on your roof.
The reason being in most instances moss on roof tiles is rarely a problem and only needs to be removed if it is blocking gutters outlets and other drainage points on the roof.
Moss absorbs and retains water.
The presence of algae on the roof is an indicator that this roof area is in a shaded spot where you may want to be alert for development of moss or other roof problems but the level of damage from algae is probably low even less than that caused by lichens.
Ultimately moss growth on a roof can result in costly repairs and can also reduce the lifespan of your roof.
The presence or absence of sunlight dictates the amount of moss or algae growth.
We had a problem where in very heavy rain the moss build up in the valley was causing water to back up and go under the tile above.
If you remove moss from the roof then you will reduce the possibility of tiles suffering from winter cracks.