Most people think it is black or dark green mold, but actually, it is a prehistoric bacterium called Gleocapsa Magma. Gleocapsa Magma is the cyanobacteria responsible for the black and dark green stains often seen on roofs. It is transported to roofs primarily by wind, rain, insects, and animals.
In addition to causing unsightly streaks and stains, these bacteria can also wreck havoc on your roof. The growth of Gleocapsa Magma is most accurately described as colonization. These bacteria grow on and within tiles and shingles, dissolving and extracting the mineral components. Overtime, Gleocapsa Magma begins to break down the contents of your tiles or shingles by feeding off the minerals embedded in them. This negatively impacts the structural integrity of your roof and has also been known to increase air conditioning bills and lead to more frequent roof repair and reconstruction. Continue reading “What’s That Stuff Growing on My Roof?”