Roof Tile Fungus

Black algae stains may be mistaken for but are not extractive bleeding a product cosmetic defect.

Roof tile fungus.

Roof lichen are symbiotic organism where fungus and algae live in a dependent relationship unfortunately their relationship can cause real damage to your roof. It s actually just a blue green algae spread by airborne spores. It is easily spread and causes those colorful stains on so many roofs. Some black stains on asphalt roof shingles are caused by a black algae sometimes misnamed as a black fungus or even a mildew such as that shown in the photograph here.

Commonly found in climates with warm humid summers it does no damage to the roofing but it certainly does looks bad. Known as black algae or roof mold gloeocapsa magma is usually blamed on dirt accumulation mold and mildew or defective shingles. It is easily spread and causes those colorful stains on so many roofs. It needs heat moisture and nutrients to grow.

It s actually just a blue green algae spread by airborne spores. The black mold like stains and streaks that appear on roofs particularly light colored asphalt shingles is actually a blue green algae gloeocapsa magma. Their formulae use tried and true zinc compounds that linger on surfaces to provide continuing protection.