Mold stains can form on roof shingles that are in permanent shade.
Fungus growing on asphalt roof shingle.
Technically the black streaks on roofs are a form of algae known as gloeocapsa magma.
Moss aides in shortening the life span of your roof because it retains moisture and in cold climates can freeze causing damage to the shingle and granules.
They call it the algaeblocksystem.
Here s why algae grows on roofs.
On an asphalt or possibly some treated wood shingle roofs shingle chemistry is also involved in moss lichens and algae growth or resistance to it.
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These stains will discolor your roof and damage the shingles over a period of time if left alone.
How to get rid of algae on the roof.
Another organism growing on your roof is moss which is a plant not a fungus or algae.
Extensive mold growth can also expose the interior of your attic or crawlspace to mold spores carrying the problem over to the inside.
Moss growing on a roof may or may not be considered attractive or quaint but there is no doubt that extensive moss on a roof can seriously damage the roof by growing under and raising or loosening.
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X research source if you live in an area with an especially humid climate you may need to give your shingles more frequent attention.
Moss can cause the leading edges of the shingles to lift or curl which increases the risk of shingle blow off during wind events.
Some roof shingle materials contain algaecides or fungicides which will also retard moss growth on the roof surface.
If you live in a humid area of the country you ve probably seen unsightly dark streaks on asphalt shingle roofs.
Find out how to remove unsightly black stains from asphalt shingle roofs caused by an algae known as gloeocapsa magma that is spread by airborne spores.
Unlike algae moss can be detrimental to asphalt shingle performance.
Commonly found in climates with warm humid summers it does no damage to the roofing but it certainly does looks bad.
In severe cases moss build up can cause lateral water movement resulting in moisture damage to the roof deck or may even cause leaks.
Scrubbing or power washing the lichen will only do more damage.
The black mold like stains and streaks that appear on roofs particularly light colored asphalt shingles is actually a blue green algae gloeocapsa magma.
Inspect your roof closely at the end of summer and following stretches of warm rainy weather when high levels of moisture can accelerate mold growth.
