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 - StainGuard Plus and StainGuard Plus PRO
1 25-year StainGuard Plus™ Algae Protection Limited Warranty and 30-year StainGuard Plus PRO™ Algae Protection Limited Warranty against blue-green algae discoloration is available only on products sold in packages bearing the StainGuard Plus™ or StainGuard Plus PRO™ logo. See GAF Shingle & Accessory Limited Warranty for complete coverage and restrictions.
Blue house with gray shingles, showing algae stains on roof.

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.
Gray roof shingles with blue-green algae stains.

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.

How does GAF Time-Release Algae-Fighting Technology work?

Specially engineered capsules are infused throughout with thousands of copper microsites. These breakthrough capsules release algae-fighting copper efficiently, over time, for long-lasting algae-fighting power.
GAF roof granules up close with copper capsules that release blue-green algae protection.

Request your educational sample

Show homeowners how GAF Time-Release Algae-Fighting Technology works to protect the beauty of their roof investment, and allows GAF to offer a 25-year StainGuard Plus™ Algae Protection Limited Warranty.*
Request Sample
125-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.

 

Learn how the 25-year StainGuard Plus™ Algae Protection Limited Warranty may help you increase sales.

Complete the StainGuard Plus™ Algae Protection Limited Warranty Playlist on the GAF Learning Portal to learn more about GAF Time-Release Algae-Fighting Technology and why algae protection is important to your customers.

Learning Portal



Add algae protection from eave to ridge

Customers can now get the benefits of GAF Time-Release Algae-Fighting Technology and the strong algae protection limited warranties on qualifying shingles, ridge caps, and even visible starter strips.

See Warranties

GAF Products with the 25-year StainGuard Plus™ Algae Protection Limited Warranty2:

Now available — our only product with a 30-year StainGuard Plus™ PRO Algae Protection Limited Warranty3

Timberline® UHDZ™ shingles now have stronger algae protection coverage

Timberline® UHDZ™ shingles feature the patent-pending Dual Shadow Line, which creates the look of sunset shadows all day. To help protect that beauty, GAF has added 10% more Time-Release Algae-Fighting Technology, making Timberline® UHDZ™ the only GAF shingle that comes with a 30-year StainGuard Plus™ PRO Limited Warranty against blue-green algae discoloration. 3
Timberline UHDZ
Package of GAF Timberline UHDZ shingles with the StainGuard Plus Pro 30-year limited warranty.
330-year StainGuard Plus PRO™ Algae Protection Limited Warranty against blue-green algae discoloration is available only on products sold in packages bearing the StainGuard Plus PRO™ logo. See GAF Shingle & Accessory Limited Warranty for complete coverage and restrictions.