Is moss and algae a big problem?
A. The main problem is the esthetics of the home. Most moss is not going to harm the roof unless there is too much of it for too long a time. Moss forms when there is organic materials from trees or other sources deposited on the roof. Usually it starts with black lichen and progresses to the green moss we all see. Moss grows best in cool shady areas usually under trees and on the north and east sides of the roof. It can do damage to the shingles over an extended period of time but doesn’t always require removal. Often more damage is done removing the moss than the moss would do if left alone.
