What Causes Mildew On Roof Shingles

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What causes mildew on roof shingles. Answered by a verified home improvement expert we use cookies to give you the best possible experience on our website. What causes black mildew on shingles on north side of roof and how can get rid. 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. Apparently the sodium causes an electrochemical reaction that reduces the elasticity of the asphalt leading to stiffness brittleness and curling of the shingles.

These black roof algal stains are sometimes misnamed or misidentified as a black fungus or even a mildew. 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. Some black stains on asphalt roof shingles are caused by a black algae typically gloeocapsa magma. There is some concern regarding the use of chlorine based products on asphalt roofs.

Damaged flashing gaps or holes in the flashing can also serve as entryways for water into your attic. Black algae stains may be mistaken for but are not extractive bleeding a product cosmetic defect. Unlike algae moss can be detrimental to asphalt shingle performance. Though often attributed to an accumulation of dirt defective shingles mold or mildew.

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.