Algae Growing On Roof Shingles

It appears on the shingles in streaks that head down the roof pitch vertically.

Algae growing on roof shingles.

Although mold can grow in your roofing materials if water gets trapped somewhere if you see any of the following on top of your roof algae are more likely your problem. The black mold like stains and streaks that appear on roofs particularly light colored asphalt shingles is actually a blue green algae gloeocapsa magma. Algae growth won t cause any structural problems to your roof but it looks ugly and it can damage the shingles over time. Algae growth is common on roof surfaces of several materials including asphalt shingles concrete and clay roof tiles and even slate.

Black streaks green or white spots round lichens mosses green moss that spreads across your roof. Algae is not a plant but an organism spread by spores. If you have noticed black spots or streaks on your roof you ve got algae on your roof. Algae will grow flush against the shingles and fixtures on your roof.

Living in a humid area of the country like florida you ve probably seen your asphalt shingle roofs with unsightly dark streaks on them. Commonly found in climates with warm humid summers it does no damage to the roofing but it certainly does looks bad. It can be brown gray blue or green.