There are many things that can affect the quality and structure of your roof. There can be damage from a storm, cracks or curling in the shingles, mold growing in the attic, or excessive shingle granules in gutters. Another problem you may notice is black streaks or stains on the asphalt of your roof. It’s common for people to think that’s normal wear and tear; but it’s actually blue-green algae and it can cause a lot of damage.

Backyard view of a large brown house with white pillars, back patio, and yard

Algae can grow and live anywhere. It especially likes to feed on the limestone of the asphalt, which is a material commonly found in roofing shingles. Algae make their way to your roof by the wind and tend to collect in corners and shaded areas; particularly where there is moisture. There’s a number of ways algae can wreak havoc on your roof, and how it can affect your home.

  • Heat Absorption:

    Because algae create darkened areas on the shingles, your roof can lose its ability to reflect sunlight. This means your house will absorb more heat, making your home warmer, especially during the summer, and therefor can lead to higher cooling costs.
  • Cracked Shingles:

    Algae can cause shingles to crack and break apart. Not only can damage be done along the surface making some areas irreplaceable, it can also lead to underlying material becoming damaged. If that happens, wood rot and mold can start to form, which can lead to far more expensive repairs if not taken care of as soon as possible.
  • Decreased Home Value:

    The presence of algae can also invite other fungus, mildew, and moss to grow on your roof, which can be unsightly, affect curb appeal, and decrease your home’s value. It can also become a health hazard for you and your family.

The best way to protect your roof and home from algae is to install special GAF StainGuard Plus shingles. These shingles contain copper ions, a material that helps prevent the growth of algae. GAF has developed time-release, algae-fighting technology that is specially engineered to release copper ions consistently throughout time. With this new level of protection, you can enjoy peace of mind knowing that your new roof will have the most durable shingles that will provide the highest level of protection against algae, moss, mold, discoloration, damage from extreme weather, and more. With such strong protection, GAF also includes a 25-year warranty.

If you’re interested in learning more about GAF’s StainGuard Plus shingles and how they can help provide long-lasting protection and prevention against algae, contact Graves Brothers Home Improvement. We’re happy to answer any questions you may have and schedule a free roof inspection. We are located in the Buffalo, Rochester, Syracuse, and Albany regions. Contact us today by using the phone numbers below or write to us anytime by visiting our website’s secure contact page.

Rochester, NY


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Albany, NY