After each cleaning you can also put some baking soda on the ridgeline of your roof since the baking soda will make an unsuitably high ph condition in which moss cannot grow.
How to get rid of moss growing on a roof.
Clean your roof moss needs a substrate such as dirt to grow in the first place so cleaning your roof once or twice a year is a great way to prevent moss growth.
This can also damage the surfaces and does little to stop the moss returning.
Q i have moss growing on my red tiled roof.
Potassium salts of fatty acids applied using a hose end spray attachment.
Using high pressure water is likely to create some of its own damage by delaminating tiles and even potentially lifting roof tiles or dislodging flashing and eroding the pointing of parapet walls and chimneys.
Experts recommend that you save roof moss removal for a cloudy day.
Moss can be removed physically with water and a stiff brush on a pole or a scrub brush chemically or a bit of both.
Hose off and brush all moss loose from your roof shingles.
Moss can lift up tiles and if left untreated this growth can actually add a substantial weight load to the roof itself.
Spray the moss covered roof with a moss control product or sprinkle the material on depending on the product formulation.