As it grows thicker it lifts and loosens shingles and allows water to leak through.
What causes mildew on roof shingles.
Apparently the sodium causes an electrochemical reaction that reduces the elasticity of the asphalt leading to stiffness brittleness and curling of the shingles.
It needs heat moisture and nutrients to grow.
Although mold can grow in your roofing materials if water gets trapped somewhere if you see any of the following on top of your roof algae are more likely your problem.
Commonly found in climates with warm humid summers it does no damage to the roofing but it certainly does looks bad.
Black algae stains on asphalt singles 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.
The most common culprit is actually a blue green algae known as gloeocapsa magma that is spread by airborne spores.
Black algae stains may be mistaken for but are not extractive bleeding a product cosmetic defect.
It is easily spread and causes those colorful stains on so many roofs.
Known as black algae or roof mold gloeocapsa magma is usually blamed on dirt accumulation mold and mildew or defective shingles.
If you live in a humid area of the country you ve probably seen unsightly dark streaks on asphalt shingle roofs.
Also moss absorbs water when it rains and retains it for long periods which can lead to mold bacteria and the decay of the roof s framing over time.
It s actually just a blue green algae spread by airborne spores.
Some black stains on asphalt roof shingles are caused by a black algae typically gloeocapsa magma.
As moss spreads it carries increased amounts of moisture and this can set into the wood of shakes and shingles and cause a roof to rot.
Moss is attracted to moisture and therein lies the problem.
The most common culprit is actually a blue green algae known as gloeocapsa magmathat is spread by airborne spores.
Though often attributed to an accumulation of dirt defective shingles mold or mildew.
As i mentioned before moss typically grows in the cracks between each shingle.
There is some concern regarding the use of chlorine based products on asphalt roofs.
Like mold mildew is a cancerous growth on damp surfaces.
If you live in a humid area of the country you ve probably seen unsightly dark streaks on asphalt shingle roofs.
Though often attributed to an accumulation of dirt defective shingles mold or mildew.
These black roof algal stains are sometimes misnamed or misidentified as a black fungus or even a mildew.
Household bleach can damage asphalt due to its high sodium content.
I suffer from two of.
