mobile view of the SG+ media landing page house

Protect against blue-green algae stains*

GAF Time-Release Algae-Fighting Technology offers protection so strong, it allows us to offer a 25-Year StainGuard Plus™ Algae Protection Limited Warranty* on many popular products.

Request an educational sample now

Learn about GAF Time-Release Algae-Fighting Technology

*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 and restrictions.