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.
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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.