Here in oregon mostly blue green algae grows on the outside of the house or on the roof shingles.
Green algae roof shingles.
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The black mold like stains and streaks that appear on roofs particularly light colored asphalt shingles is actually a blue green algae gloeocapsa magma.
We ll explain more of that in a bit.
A roof may develop different types of algae lichens and fungi as bacteria take over.
While some people actually like the look of moss on their.
The only way to take care of it is to use a high base chemical solution like zinc sulfate.
Black or brown or green algae stains on asphalt roof shingles.
Algae can cause unsightly stains and growths on your new roof.
Many homeowners mistake algae for roof mold in most cases however it is really a blue green type of algae and when it dies it leaves dark streaks on your roof.
What is roof algae.
Commonly found in climates with warm humid summers it does no damage to the roofing but it certainly does looks bad.
Misnamed as mildew or fungus by some writers algae staining on asphalt shingles usually in shaded areas or on the more shaded roof slopes characterized by black staining fairly uniform over shingles but appearing specifically in areas of the roof shaded by nearby trees.
Though often attributed to an accumulation of dirt defective shingles mold or mildew.