Gloeocapsa Magma AKA ‘Black Streaks – Algae’ Explained

A Summary in Brief Those dark streaks running down your roof are more than just stains. In most Northern Virginia neighborhoods, they are caused by Gloeocapsa magma, a roof-eating bacterium that feeds on the protective granules in your shingles. Over time, it makes your home look neglected, can trigger HOA notices, and can shorten the…

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