What Causes Stains On Roof Shingles

The algae feed on the limestone in shingles.

What causes stains on roof shingles.

Roofing manufacturers have tackled the problem of roof algae by creating shingles containing copper which is deadly to algae. As it grows it will also trap moisture in the shingles causing them to age sooner than they should. They say that while shingle manufacturers offer products treated with copper or zinc to inhibit algae growth their effect wears down over time. 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.

The algae will worsen and become more noticeable each year trapping moisture and causing premature shingle aging and granule loss. Algae dark stains on asphalt roof shingles the primary species of algae that tends to collect and grow on roofs is called cyanobacteria gloeocapsa magma algae which is contained in and transported through the air. Algae 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.

As the blue green algae accumulate they develop a dark hardened outer coating which results in the black stains you see. Here we discuss the causes of algae growth on roof shingles the effects of these conditions and how to cure or prevent algae formation on roofs. Light spots on roof shingles dark colored asphalt shingles may appear lighter and patchy as they age. Water stains if the discoloration seems to be damp check the attic or ceiling below the roof stain and investigate for a leak.

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. Causes cures of black brown or green algae staining on roof surfaces. Btw don t leave those stains on the roof as they will eat away at the shingles and cause the lifespan of your roofing material to decrease by years. Over time this algae accumulates developing a black outer coating which causes stains on roof shingles.

Reply thomas boni july 13 2020 at 12 18 pm. Look in the gutters for signs of asphalt granules that have washed off and expect to need a replacement. With each passing year the algae will grow and become more and more noticeable.