What Causes Black Stains On Roof Shingles

Black streaking on roofs is a common problem.

What causes black stains on roof shingles.

Spray the black stains first then the entire roof so the stains get a second dose. The streaks are caused by a type of algae known as gloeocapsa magma. It is not uncommon for roof shingles to turn black over time. 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. Roofing manufacturers have tackled the problem of roof algae by creating shingles containing copper which is deadly to algae. Algae dark stains on asphalt roof shingles. Here is a diagnostic guide to types of stains and staining materials found on roof surfaces black red green brown or other coloured stains on asphalt roof shingles or on other roofing materials need first an accurate diagnosis of the stain cause and then proper steps to remove the stain or to prevent future staining on roof shingles surfaces.

Black stains on roofs. The black roof stains are caused by a form of algae that has been around for years typically found in the woods on the north side of trees or on exposed rocks. Mix the soap and water well first then add the bleach. Here is our catalog listing the types of black stains that are found on roofs using asphalt shingle roofs as the prime example.

This will cover 200 sq. Over time this algae accumulates developing a black outer coating which causes stains on roof shingles. The bleach degrades into salt which kills microbial growths and the sodium silicate does the same. The algae will worsen and become more noticeable each year trapping moisture and causing premature shingle aging and granule loss.

Roof shingles are exposed to a lot of wear and tear as extreme heat sun wind and precipitation come into contact with them. But now this black algae is termed a roof shingle algae because of the annoying discoloration on a asphalt shingle roof. These roof invaders require a moisture rich environment usually. Algae growth may cause discoloration on roofs resulting in brown or black streaks on a rooftop.

This article series tells readers how to identify explain the most common causes of black brown red gray green or white stains appearing on roof shingles and on other building surfaces. While the streaks do not cause a great deal of damage they can cause the shingle to age prematurely. Learn more about what causes dark streaks on a roof and how to address the issue.