Black Mold On Roofing Shingles

The black streaks are also known as black algae or roof mold.

Black mold on roofing shingles.

Mold stains can form on roof shingles that are in permanent shade. 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. Not only is it unattractive it can actually shorten the life of your shingles so you really should get rid of it. Believe it or not those black streaks only appear on roofs in certain areas of the country.

I am really disappointed the treated shingles didn t work. The black mold like stains and streaks that appear on roofs particularly light colored asphalt shingles is actually a blue green algae gloeocapsa magma. In reality what you are seeing is not black mold but a bacteria that is called gloeocapsa magma. These stains will discolor your roof and damage the shingles over a period of time if left alone.

Technically the black streaks on roofs are a form of algae known as gloeocapsa magma. Black mold on asphalt shingles is ugly. Extensive mold growth can also expose the interior of your attic or crawlspace to mold spores carrying the problem over to the inside not to worry though because you can clean the mold off with basic household bleach and save. Granted some of it could be mold but what is spreading like wildfire is gleocapsa magma.

You clean it and it returns year after year. Commonly found in climates with warm humid summers it does no damage to the roofing but it certainly does looks bad.