Pollution, tree sap and jet exhaust are the first things people think of when they see staining on their roof. Many are surprised to find that virtually all roof staining and discoloration is organic matter in various stages of growth and decay. Algae, mold, mildew, lichen, and moss are the main culprits. The black roof streaks you see are actually algae called Gloeocapsa Magma. This algae spreads itself by unseen microscopic spores, just like a dandelion weed. If you're thinking about replacing the roof on your home or business because of the streaks, then think again.
Owens Corning, the worlds largest shingle manufacturer, feel that the black streaks on your roof (an algae known as gleocapsa magma) can cause premature granule loss w/o periodic roof cleaning, and considerably shorten the life of your residential or commercial roof! As your roofing shingles are turned black by the growing algae, they retain more heat leading to increased shingle deterioration. Your black roof algae infestation can and will easily spread to your neighbors home if roof cleaning is not performed.
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