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Understanding Roof Streaks and How to Fix Them
If you’ve noticed black streaks or dark patches on your asphalt shingle roof, particularly common in southern regions, you may be wondering what causes them. These unsightly marks are not just dirt or grime; they’re actually the result of living spores from a type of cyanobacterium algae that feeds on the limestone in your roof shingles. Over time, this algae can damage the integrity of your roof and significantly reduce its lifespan.
The culprit behind these black streaks is Gloeocapsa magma. This algae thrives on the mineral content in asphalt shingles, particularly the limestone that’s commonly used in roofing materials. The bacteria settle on the roof, often more densely on the north-facing sides where moisture tends to linger. The dark stains you see are actually the bacteria colonies themselves, which spread over the surface of your shingles.
How CEERTAIN Works
The treatment, named CEERTAIN™ (Cost Effective, Environmental Roof Treatment Application Incredibly Noticeable), works by killing the algae spores and allowing the natural process of rainwater to scrub them away. While it’s not an immediate fix, the results are long-lasting and will gradually restore the appearance of your roof, extending the life of your shingles. CEERTAIN™ rejuvenates your roof by removing the algae buildup, which helps to prevent further damage.
What makes CEERTAIN™ stand out from other products is its simplicity and environmental safety. It’s easy to apply, cost-effective, and provides a lasting solution that can help avoid the need for expensive roof replacements. For a one-time application cost of just a few hundred dollars, this product offers a fraction of the cost compared to roof replacement.
The Growing Market for Roof Treatment
With many homes in the southern U.S. suffering from algae streaks on their roofs, there’s a vast market for this roof remediation treatment. Homeowners and property managers across the region are starting to realize that treating their roofs with CEERTAIN™ is an affordable and effective alternative to costly roof replacements. As more data is collected, additional before-and-after photos and testimonials will be shared on a dedicated website (www.ceertain.com) to further showcase the effectiveness of this innovative solution.
If you're interested in learning more about how CEERTAIN™ can benefit your roof, or if you'd like to schedule an application, feel free to email [email protected], or enter as much data as you like on the CEERTAIN™ Application page. You can also drop us a note in the Leave a Review page.
Don’t wait until your roof shows severe signs of wear—invest in CEERTAIN™ today to maintain the integrity of your roof and extend its lifespan, all while saving money and protecting the environment.

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Don't let roof bacteria compromise the beauty and durability of your home. Contact us today for a free assessment and personalized roof cleaning plan. Our team is ready to answer your questions and help protect your investment, reach out now to schedule your consultation!