The most common culprit causing these unsightly stains on asphalt roofs is a blue green algae called Gloeocapsa magma. Over the past 25+ years, this strain of roof algae has become hardier and has migrated to less humid environments. It has now become a common sight on asphalt roofs across 80% of the United States. The unsightly growth usually occurs on the north or west side, as well as, shaded areas of the roof system. As the roof algae grows and decomposes, it holds moisture which accelerates its growth and the deterioration of your asphalt shingles.

Stained Roofs Aren't Only An Eyesore, They Lead To Early Roof Replacement

Mold/Algae/Fungus not only discolors your roof, but it's shortening the life of the roof shingles leading to earlier than necessary roof replacement. Mold/Algae/Fungus discolors the surface, dislodges the protective granules and absorbs solar heat, increasing energy bills.

The presence of these algae in such close proximity to a living environment can pose some health concerns for those with allergy problems. The possibility does exist for these algae to invade the home through exposed areas such as roof vents and cause other problems. Roof cleaning will decolonize and remove these micro-organisms, reducing the risk to you and your family.

An otherwise sound roof needs regular maintenance or repair to keep it in, or to return it to, its optimal operating condition.

Cleaning Roof Algae From a Stained Roof

The removal of roof algae is always more difficult and costly than its prevention. Feazel recommends your roof be cleaned and receive a preventive treatment every 12-24 months to keep the stains from returning and ensure your roof’s sustainability. We created a detailed walk through on how to safely remove algae from your roof.

Traditional roof cleaning methods use high pressure washing and hazardous chemical ingredients such as bleach, sodium hydroxide (Lye), copper, zinc, or acid. These techniques can damage the integrity of the roof, kill your landscaping and cause harm to siding, brick, windows, gutters or even pets.  

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