Black Algae On Roof Shingles

As the blue green algae accumulate they develop a dark hardened outer coating which results in the black stains you see.

Black algae on roof shingles.

The most common class of roof algae is gloeocapsa magma a bacterium that eats water and expels oxygen. Technically the black streaks on roofs are a form of algae known as gloeocapsa magma. I am really disappointed the treated shingles didn t work. The streaks look like mold but they re actually algae colonies that form in your shingles and feed on moisture and the limestone filler agents in the shingles.

The black streaks are also known as black algae or roof mold. The algae feed on the limestone in shingles. The algae will worsen and become more noticeable each year trapping moisture and causing premature shingle aging and granule loss. If you live in a humid area of the country you ve probably seen unsightly dark streaks on asphalt shingle roofs.

Here s why algae grows on roofs. Black streaks on the north and west facing and shaded areas of your asphalt shingled roof can really wreck the appearance of your home. To save money most shingle manufacturers have switched to shingles containing asphalt but mostly made up of fillers such as fiberglass and crushed limestone which encourages the growth of algae. Algae grow most often on wood and asphalt shingles or concrete tiles especially if they do not get a lot of sunlight.

To clean an asphalt shingle roof to remove black algae stains. Causes cures of black brown or green algae staining on roof surfaces. These algae use the crushed limestone filler as a main food source. Algae stains on roofs.

I covered our asphalt shingle roof about five years ago with white 50 year guaranteed shingles that had algae prevention treatment but now the entire north side of our roof is black with algae i bought the shingles from lowe s in marianna florida. Roof algae generally have a black green hue. Weather is a factor in algae growth on shingles.