Question: do gaf timberline hd shingles have stainguard?
Answer: Find out how GAF StainGuard™ Plus time release technology can help prevent ugly roof algae stains. ... StainGuard Plus™ Time-Release Technology and 25-year limited warranty against blue-green algae discoloration available only on Timberline Ultra HD® Shingles sold in packages bearing the StainGuard Plus™ logo.