Gloeocapsa magma, also known as blue-green algae, has spread throughout more than 80% of the U.S., leaving dark black stains wherever it grows, and making millions of perfectly good roofs — and the homes they protect — look old before their time.
That's why we're proud to introduce StainGuard Plus™ Time-Release technology. It’s algae resistance so powerful, it comes with a 25-year ltd. warranty against blue-green algae discoloration.*
Many traditional algae-resistant shingles use a granule technology developed more than a quarter century ago. The granules contain a layer of algae-fighting copper that is released onto the roof when it’s wet. But as the roof ages, those older granules release less and less copper, reducing the shingle’s algae resistance.
StainGuard Plus™ Time-Release technology from GAF releases algae-fighting copper more efficiently, over time, for long-lasting algae-fighting power.
Unlike the older layered technology, StainGuard Plus™ technology uses specially engineered capsules* that are infused throughout with thousands of copper microsites so copper remains within reach, ready to be activated in the battle against blue-green algae stains.