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

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.
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.

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

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.