We live in a highly infected roof algae staining area. The limestone filler in your shingle is the primary cause. The GA-400 has the proper solution, The ARMA, (Asphalt Shingle Manufacturer Association) recommends a periodic cleaning process that is affordable and can remove those unsightly stains and restore your shingles original appearance.
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Algae That Grows On Your Roof
Often mistaken as mold or mildew , the black discoloration and streaks visible on many roofs across the United States and Canada are actually algae. The algae can form where moisture tends to dwell on roof surfaces. Coastal or humid climates create the most conducive conditions for algae growth. The most common type, gloeocapsa magma or blue green algae, protects itself from damaging ultraviolet rays by producing a dark pigmented sheath. The algae discoloration typically begins as small spots then quickly transforms into streaks on the roof plane. By the time the algae is visible, it likely has been present for several months or longer.
Algae spores are carried by the wind or by animals and can quickly spread from one rooftop to another. That is why it is common to see algae growth on rooftops throughout an affected neighborhood. The same is true for apartment or condominium complexes, townhouses or row houses. On highly reflective or “cool” roofs, algae will undoubtedly have a negative impact on the long-term effectiveness of these roof systems. That is why it is important to address an algae problem as soon as possible.Tired of ugly black streaks on roof? Don’t spend $5k-$15k to replace your entire roof! Call us to soft wash your shingles for a fraction of the price and rid yourself of that roof algae.