What Causes Black Stains On Roof Shingles

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.

What causes black stains on roof shingles. This will cover 200 sq. Algae growth may cause discoloration on roofs resulting in brown or black streaks on a rooftop. Spray the black stains first then the entire roof so the stains get a second dose. Mix the soap and water well first then add the bleach.

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. Replacing the shingles on your roof just because you have black stains is not necessary however and you should be suspicious of any roofer that suggests roof shingle replacement as the only solution to your algae problem. As the blue green algae accumulate they develop a dark hardened outer coating which results in the black stains you see. The bleach degrades into salt which kills microbial growths and the sodium silicate does the same.

When that happens it is generally caused by mildew algae mold or dirt stains. Algae dark stains on asphalt roof shingles. These roof invaders require a moisture rich environment usually. Black stains on roofs.

Over time this algae accumulates developing a black outer coating which causes stains on roof shingles. It is not uncommon for roof shingles to turn black over time. The algae will worsen and become more noticeable each year trapping moisture and causing premature shingle aging and granule loss. 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.

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. Roof shingles are exposed to a lot of wear and tear as extreme heat sun wind and precipitation come into contact with them. The streaks are caused by a type of algae known as gloeocapsa magma.

Black streaking on roofs is a common problem. Here is our catalog listing the types of black stains that are found on roofs using asphalt shingle roofs as the prime example. Learn more about what causes dark streaks on a roof and how to address the issue.