The discoloration on your roof is caused by Gloeocapsa magma (GM). GM is a cyanobacteria that has existed on earth for about 3 billion years! It loves humid, damp, low-light environments, making the north side of your house an ideal place for it to take root. Feeding off the moisture and calcium carbonate in your shingles, GM accumulates, creating the black streaks and smears often seen on roofs. In time it can spread over the whole roof system, leading to shingle decay, loss of shingle granules, and early roof replacement.
Asphalt Roof Manufacturers Association (ARMA) and major shingle manufacturers, like GAF and Owens Corning, have guidelines for the proper care and maintenance of your roof. The process consists of a low-pressure application of the recommended cleaning detergent that is designed to safely remove any algae, moss, lichens, and airborne pollutants. NEVER use high pressure when cleaning your roof, as this can lead to granule loss and can even void your roof’s warranty. Oakland Power Washing strictly follows the recommended guidelines and will provide a personalized solution that is safe, to industry standards, and effective for you and your property.
On average, if not maintained, most of our customers will not see substantial regrowth for 2-3 years. Please ask about our Roof Maintenance Package. Serving Clarksville and Hopkinsville.
Find out more here: https://www.asphaltroofing.org/algae-discoloration-of-roofs/