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Why are there black streaks on my roof?

Black streaks on the roof

Posted by PhilBlack streaks on a roof, Blue-green algae, Roofing Grangerblack streaks on a roof, blue-green algae, roof streaks, stained roofPosted on February 28, 2023

Blue-green algae on a shingle roof can be identified by the tell-tale presence of black streaks.