What causes black streaks on shingles?

What causes black streaks on shingles?

The black streaks running down roofs are actually a hardy algae called Gloeocapsa magma. As the blue-green algae accumulate, they develop a dark, hardened outer coating, which results in the black stains you see. The algae feed on the limestone in shingles.

How do you treat mold on a roof?

You may spray wash the roof with 1 part water and 1 part bleach to clean off the algae. Let is sit for around 60 minutes before rinsing. If you find bleach and water solution weak for your moldy roof, you may use trisodium phosphate. Mix a cup of it for every gallon of water.

What’s the best way to remove mold from asphalt shingles?

Twigs, leaves, and sticks that accumulate on the roof should be promptly removed with a leaf blower. Always direct the airflow down the slope of the roof, so debris doesn’t get stuck under the shingles. Keep the gutters clean and clear. If a higher roof is draining onto a lower roof, that’s a recipe for algae and moss growth.

How to remove black algae stains on asphalt shingle roofs?

How to Remove and Prevent Black Algae Stains on Asphalt Shingle Roofs | Today’s Homeowner Find out how to remove unsightly black stains from asphalt shingle roofs caused by an algae known as Gloeocapsa Magma that is spread by airborne spores.

What’s the best way to clean mold off a roof?

Put on rubber gloves and a breathing mask before proceeding, so you can protect your skin and your lungs from the fumes produced by both bleach and trisodium phosphate. In a two-gallon bucket, create a cleanser composed of 1/4 chlorine bleach and 3/4 water.

Why is there black mold on my asphalt roof?

Black mold stains, streaks, and clumps of moss growing on the roof look unsightly. You may also worry that mold growth will harm your asphalt shingles and reduce the roof’s lifespan. No one likes having to buy a new roof much sooner than anticipated. In hot and humid climates like Tampa, algae growth on asphalt shingles can be a real problem.