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Why is there mold on my roof?

May 12, 2014 | Filed under: Metal Roofing,News

Why Is There Mold On My Roof? Truth is, the mold on your roof is actually not mold.  It’s an algae-like bacteria.  Its science name is gloeocapsa magma. Gloeocapsa magma is a cyanobacteria which feeds on limestone.  Modern asphalt shingles contain limestone as a filler. The gloeocapsa magma feeds on the limestone and moisture in… ( read more )