Black Streaks (Algae)
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…
Read MoreWhy Black Streaks Appear on Your Sidings and Roofs
In a Nutshell If you’ve noticed dark streaks running down your roof, you’re not alone. These unsightly black marks are a common problem for homeowners throughout Fairfax, Loudoun, and Prince William Counties and can damage shingles, reduce energy efficiency, and hurt curb appeal. Understanding what causes these streaks and how to address them can help…
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