Moss, which thrives in moist, shady areas, can lead to leaks and serious roof damage, writes Brian Rader. To help prevent these problems, homeowners should trim back trees and other vegetation that touches or shades areas where moss growth is a concern. Plant debris and branches also should be cleared from the roof because they can contribute to shade and moisture. Metal roofs work best for moss prevention, he notes.
source: SanJuanIslander.com (Friday Harbor, Wash.)
