Research1  shows that homeowners really care about protecting their new roofs from the dark stains they see throughout their neighborhoods — stains caused by blue-green algae.

So GAF developed Time-Release Algae-Fighting Technology, which delivers algae-fighting copper in a whole new way. Specially-engineered capsules, infused throughout with thousands of copper microsites, release copper steadily over time, for long-lasting algae-fighting power.

It’s algae resistance so powerful it allows GAF to offer a 25-year StainGuard Plus™ Algae Protection Limited Warranty2 against blue-green algae discoloration on many of their most popular products, including America’s best-selling shingle, Timberline HDZ®. And when installed with the required combination of four GAF Accessories, Timberline HDZ® Shingles are eligible for the WindProven™ Limited Wind Warranty with no maximum wind speed limitation.3

In addition, many other qualifying  GAF Ridge Cap Shingles and visible Starter Strips also come with the 25-year StainGuard Plus™ Algae Protection Limited Warranty2 — which enables roofers to offer excellent algae protection from eave to ridge.

gaf.com/stainguardplus

1.    Based on 2021 survey commissioned by GAF of 500 homeowners in areas with moderate to high amounts of blue-green algae

2.    25-year StainGuard Plus ™ Algae Protection Limited Warranty against blue-green algae discoloration is available only on products sold in packages bearing the StainGuard Plus ™ logo. See GAF Shingle & Accessory Limited Warranty for complete coverage,  restrictions and qualifying products.

3.    15-year WindProven™ limited wind warranty on Timberline HDZ® Shingles requires the use of GAF starter strips, roof deck protection, ridge cap shingles, and leak barrier or attic ventilation. See GAF Roofing System Limited Warranty for complete coverage and restrictions. Visit gaf.com/LRS for qualifying GAF products. For installations not eligible for the WindProven limited wind warranty, see GAF Shingle & Accessory Limited Warranty for complete coverage and restrictions.