If you have dark streaks or discoloration on your roof shingles, it’s most likely because you live in a high humidity area (like Florida). Those dark streaks and discoloration are caused by a blue-green algae called Gloeocapsa Magma. These algae spores are spread through the air and will plant themselves on your entire roof except for where you have metal flashing.
The metal flashing on your roof is typically coated with zinc or copper, both of which are toxic to algae. That’s why you see streaks and not a solid coating of algae because when it rains, small amounts of copper and zinc drip down the flashing and onto your roof preventing the algae from growing in those areas.
Will the Discoloration Caused by Algae Spores Hurt My Roof?
No, the discoloration on your shingles from the algae spores won’t hurt your roof. However, it does make your house look bad and could ultimately lower the value of your home. This is because most people will perceive the algae as a roofing issue or that you haven’t properly maintained your roof.
How Can I Get Rid of the Discoloration on My Roof?
There are a few ways to temporarily get rid of the algae on your roof. You can use a chemical cleaner, but repeated use of a harsh chemical cleaner will reduce the life expectancy of your asphalt shingles and harm the landscaping around your house. Some people have attempted to power wash their roof. The problem with power-washing is that it removes the granules from your shingles which reduces their life expectancy and can void your roof’s warranty. The best option is to clean it with an eco-friendly solvent that is designed specifically for removing algae without damaging your shingles or plants. Regardless of the method that you use, cleaning is only a temporary solution, and the algae will return unless preventative measures have been taken to stop its growth.
How to Prevent Algae from Growing on My Roof’s Shingles?
There are two effective ways to prevent algae from growing on your shingles. The first way is to have a roofer install a copper or zinc-coated strip of sheet metal below the ridge. Yes, you could do this yourself; however, if not done properly, you could create leaks in your roof and void your roof’s warranty. Most shingle manufacturers have specific methods that must be adhered to when it comes to honoring a roof’s warranty.
The second and preferable way to prevent algae from growing on your roof is to install algae resistant shingles. These are shingles that have copper granules infused into the shingle to prevent the growth of algae. At Perry Roofing Contractors, all of the shingles we install come infused with 6% copper granules to ensure that the roof looks great when we install it and for years to come.
If you would like more information about getting rid of or preventing discoloration on your roof’s shingles, please Contact Us today. Perry Roofing Contractors has served Gainesville and all the surrounding areas since 1976, and we’d love to serve you too!
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