What causes roof shingle discoloration?
What causes roof shingle discoloration? Algae Growth on Asphalt Shingles Algae growth may cause discoloration on roofs resulting in brown or black streaks on a rooftop. Algae may be mistaken for soot, dirt, or tree droppings, most of which typically produce only localized discoloration. How do you clean discolored shingles? Read more…