Roof & Deck Cleaning

Roof & Deck Cleaning

Roof Cleaning

These roof stains, often mistaken for “roof mold,” are the dead cells of a hardy algae called black algae on roof shingles, roof mold prior to cleaningGloeocapsa Magma.  The algae grow on the north side of the roof that gets the least amount of sun and stays damp the longest.  They feed on limestone filler in the shingles and grow and darken until removed. Airborne algae spores are carried from roof to roof and can infest a whole neighborhood.
Can the algae on the roof shingles damage my roof?
Algae feed on the limestone filler used to give the shingles weight.  Over time the ceramic granules protecting the surface of the shingle begin to loosen and wash off.  This diminishes the roof’s ability to reflect heat rays which can overheat a roof increasing air conditioning bills and shortening shingle life.  Algae on roof shingles also encourages other damaging biological growth, such as lichens and roof moss. 

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