Advanced Algae Protection
Help protect your roof investment with powerful algae resistance.
25 & 30-year limited warranties against blue-green algae discoloration available on qualifying GAF products¹
GAF Advanced Algae Protection Limited Warranties
Protect your customers1 new roofs from eave to ridge with algae resistant shingles from GAF. Select GAF shingles, hip and ridge caps, and starter strips come with the 25-Year StainGuard Plus™ Algae Protection Limited Warranty. Or offer your customers the 30-Year StainGuard Plus PRO™ Algae Protection Limited Warranty with Timberline UHDZ® Shingles with 10% more Time-Release Algae-Fighting technology.125 year StainGuard Plus™ Limited Warranty against blue green algae discoloration is available only on products sold in packages bearing the StainGuard Plus™ logo. 30 year StainGuard Plus PRO™ Limited Warranty against blue-green algae discoloration is available only on products sold in packages bearing the StainGuard Plus PRO™ logo. See GAF Shingle and Accessory Limited Warranty for complete coverage and restrictions.
What is blue-green algae?
The dark stains you see on a roof are often caused by tiny cyanobacteria called Gloeocapsa magma — a bacteria commonly known as blue-green algae. It can leave some nasty stains. GAF Time-Release Algae-Fighting Technology helps prevent these stains to protect a homes curb appeal.
What causes roof algae to grow?
Blue-green algae is a bacteria that travels on the wind and thrives in moist environments — so if one house in a neighborhood has it, others have probably been exposed as well.
Get the tech no one else has with GAF Time-Release Algae-Fighting Technology
Proprietary to GAF, our Time-Release Algae-Fighting Technology is engineered with thousands of copper microsites that release algae-fighting copper efficiently, over time, for long-lasting algae-fighting power.
Explore all residential warranties
Backed by North America’s largest manufacturer of roofing products, GAF warranties and guarantees are among the strongest in the roofing industry. See our easy-to-follow guide to warranties available for GAF residential roofing products to help find the right one for you.
Get protection you can see on our best-selling shingles: Timberline HDZ® and Timberline UHDZ®
Timberline HDZ® Shingles
Find out why Timberline HDZ® Shingles are the #1-selling shingles in North America — and include a 25-year StainGuard Plus™ Limited Warranty against blue-green algae discoloration.¹
Timberline UHDZ® Shingles
Timberline UHDZ® Shingles feature the patent-pending Dual Shadow Line, for sunset shadows all day long — and are the only GAF shingle that comes with a 30-year StainGuard Plus™ PRO Limited Warranty against blue-green algae discoloration.¹
¹ 25 year StainGuard Plus™ Limited Warranty against blue green algae discoloration is available only on products sold in packages bearing the StainGuard Plus™ logo. 30 year StainGuard Plus PRO™ Limited Warranty against blue-green algae discoloration is available only on products sold in packages bearing the StainGuard Plus PRO™ logo. See GAF Shingle and Accessory Limited Warranty for complete coverage and restrictions.
Explore all products covered by the 25-year algae warranty1
Additional GAF products with Time-Release Algae-Fighting Technology and a 25-year StainGuard Plus™ Algae Protection Limited Warranty²:
Add a finishing touch that helps defend against leaks at the hips and ridges, now with a 25-Year StainGuard Plus™ Algae Protection Limited Warranty*.
GAF Timberline® Lifetime Architectural Roofing Shingles - North America’s #1 Selling Shingle, now with a 25-Year StainGuard Plus™ Algae Protection Limited Warranty*.
A wide array of designer styles and colors, to match your home, taste, and budget, now with a 25-Year StainGuard Plus™ Algae Protection Limited Warranty*.
Help guard against shingle blow-offs, now with a 25-Year StainGuard Plus™ Algae Protection Limited Warranty*.
125 year StainGuard Plus™ Limited Warranty against blue green algae discoloration is available only on products sold in packages bearing the StainGuard Plus™ logo. 30 year StainGuard Plus PRO™ Limited Warranty against blue-green algae discoloration is available only on products sold in packages bearing the StainGuard Plus PRO™ logo. See GAF Shingle and Accessory Limited Warranty for complete coverage and restrictions.
225-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 and restrictions.
Read more about how GAF products can protect your home
What's the best way to prevent blue-green roof algae stains?
How to help protect your roof against blue green roof algae discoloration.
Learn about prevention
Does moss on a roof die in winter?
Learn about how to handle moss growth on a roof.
Learn about moss
Comparing GAF Timberline UHDZ® vs. HDZ® Shingles
Learn about the differences of these two shingles and how one might be right for your project.
Understand the difference