Posted on Sep 23, 2018

Commercial Restorations

Why are black streaks appearing on your roof?

The black streaks on roofs are a type of algae called Gloeocapsa magma. It usually starts as a blue-green algae and as it matures it develops a dark, hardened outer coating, which results in the black stains you see.

The black stains caused by this algae will worsen and become more noticeable each year, trapping moisture and causing premature shingle aging and granule loss. If you don’t like the black streaks, they can be cleaned using professional grade roof cleaning solutions.
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