Can the algae on 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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