The black streaks are a mold/algae called Gleocapsa Magma. They feed off the roof shingle and are usually most prominent on the North side of the roof where there is less sunlight and more dampness. The growth of the algae can cause damage and reduce the lifespan of the roof. In addition it can increase the cost of cooling your home in the summer months. There are tons of in-depth articles on the internet that one can read and become well-versed on this subject. The most important point is, once you see the streaks, the mold has already been living in your roof surface for a while and it is time to have it professionally removed.
All Clean Power Washing is Licensed, Insured and CERTIFIED to professionally clean your roof. We use a low-pressure cleaning treatment approved by our trade organization (pwna.org) and the manufacturers of asphalt shingles. We offer a FULL 2 year warranty (some companies are now offering up to 5 year limited warranties but read the small print). Call today for a free estimate. We can make your roof look NEW again!
All Clean Power Washing and Roof Cleaning 877-325-3215
allcleanpowerwashing.com