Can you really clean a shingle roof? The major shingle manufacturers say the answer is yes. Asphalt shingles suffering from a type of airborne algae called Gloeocapsa Magma can be cleaned to restore the roof’s appearance. This alga appears as black stains or streaks on your roof.
Roof algae normally first appears on the north facing slopes of the roof where the prevailing amount of shade and moisture are present. The algae lands on the roof and feeds on nutrients in the shingles, as it rains the algae is spread down the roof causing the black streaks.
This condition will deteriorate the roof prematurely by not letting the shingles reflect heat like they need to.
The good news is this alga can be killed and removed by using methods recommended by the shingle manufacturers without causing damage to the shingles. Having your algae covered roof cleaned, while the shingles are still in good shape, is a great way to save yourself the cost of a total roof replacement and insure you'll get the full life out of your roof.
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