Blue-green algae is a common roofing problem that annoys homeowners. Carried by the wind, these microscopic spores multiply upon landing on damp areas of the roof, forming a visible green- or black-colored mass. Though they don’t pose any structural threat to residential roofing systems, these can make once-beautiful shingles unsightly.[Read more…]
Discoloration of the protective covering of roofing systems has a variety of causes. Quick diagnosis of the problem, however, can be achieved by considering the stain color and its location on your roof.