What Causes Mildew On Roof Shingles

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.

What causes mildew on roof shingles.

What causes black mildew on shingles on north side of roof and how can get rid. These black roof algal stains are sometimes misnamed or misidentified as a black fungus or even a mildew. There is some concern regarding the use of chlorine based products on asphalt roofs. I suffer from two of.

Unlike algae moss can be detrimental to asphalt shingle performance. Moss can cause the leading edges of the shingles to lift or curl which darkening the shingles to restore the inherent beauty of the wood will involve cleaning staining and sealing each shingle for routine mildew and light mold this step can be eliminated. The most common culprit is actually a blue green algae known as gloeocapsa magma that is spread by airborne spores. Though often attributed to an accumulation of dirt defective shingles mold or mildew.

Damaged flashing gaps or holes in the flashing can also serve as entryways for water into your attic. Answered by a verified home improvement expert we use cookies to give you the best possible experience on our website. If you live in a humid area of the country you ve probably seen unsightly dark streaks on asphalt shingle roofs. Apparently the sodium causes an electrochemical reaction that reduces the elasticity of the asphalt leading to stiffness brittleness and curling of the shingles.

Missing shingles a heavy storm can blow shingles off a roof especially on houses where the shingles have been weakened due to the growth of moss mold mildew or algae.