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Why is there mold on my roof?

May 12, 2014

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 )