What Causes Black Stains On Roof Shingles

The streaks are caused by a type of algae known as gloeocapsa magma.

What causes black stains on roof shingles.

The algae will worsen and become more noticeable each year trapping moisture and causing premature shingle aging and granule loss. The bleach degrades into salt which kills microbial growths and the sodium silicate does the same. It is not uncommon for roof shingles to turn black over time. Algae dark stains on asphalt roof shingles.

Mix the soap and water well first then add the bleach. Black streaking on roofs is a common problem. Black marks became a problem about 20 years ago when manufacturers began adding limestone granules to add weight to material used to coat shingles. 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.

When that happens it is generally caused by mildew algae mold or dirt stains. Algae growth may cause discoloration on roofs resulting in brown or black streaks on a rooftop. Over time this algae accumulates developing a black outer coating which causes stains on roof shingles. Roof shingles are exposed to a lot of wear and tear as extreme heat sun wind and precipitation come into contact with them.

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 black spots discoloring your asphalt roof are more than likely the pervasive and prevalent algae known as gloecapsa magma. Roofing manufacturers have tackled the problem of roof algae by creating shingles containing copper which is deadly to algae. This will cover 200 sq.

While the streaks do not cause a great deal of damage they can cause the shingle to age prematurely. These roof invaders require a moisture rich environment usually. The algae feed on the limestone in shingles. Learn more about what causes dark streaks on a roof and how to address the issue.

Roof experts tell our researchers that though other components are being added to shingles to hinder algae growth they still get calls to deal with black marks on relatively new roofs.