If you reside in an area with frequent dry, humid weather, then you’re probably familiar with unsightly dark streaks on asphalt shingle roofs. A lot of people usually mistake this stain for dirt accumulation or mold and mildew buildup. However, the true culprit is called Gloeocapsa Magma, a blue-green algae that’s spread by airborne fungal spores. This means that if your neighbor’s roof has it, your roof has been exposed as well.
In this post, local gutter companies discuss how to prevent and get rid of blue-green algae.
Install Algae-Resistant Shingles
Blue-green algae commonly thrive on wood and asphalt-based roofs. Though there’s no concrete evidence that proves blue-green algae are damaging to asphalt shingles, the unsightly look can still affect the curb appeal and resale value of your property.
In recent years, asphalt shingle manufacturers have developed shingle granules that can help prevent the growth of algae. They mix metal ions such as zinc and copper granules into roofing products to create algae-resistant shingles. When it rains, water picks up the algae-preventing ions and distributes them over the roof’s surface.
Professional siding contractors suggest installing GAF StainGuard® shingles for the best quality of copper-containing granules that can protect your home long-term.
A simple fix for the dark stains that blue-green algae produce is chemical cleaning. The Asphalt Roofing Manufacturers Association, or ARMA, suggests using a 50/50 solution of chlorine bleach and water. You simply need to apply the mixture to the roof’s surface and rinse it after 15 to 20 minutes. Other cleaning methods shouldn’t be used unless the shingle manufacturer approves them.
Also, keep in mind that repeated use of harsh chemicals or power washing may cause erosion and shorten the lifespan of your shingles. The ideal solution is to prevent algae from spreading by opting for algae-resistant shingles.
Affordable Roofing, Siding and Gutters is one of the leading providers of reliable exterior remodeling services in Cleveland, Tennessee. You can trust us with your roof maintenance, window replacement and gutter installation needs. Our reliable team will guide you through a smooth, stress-free experience! Call us at (423) 584-5600 or fill out this contact form to set up an appointment.