Experience deep, rich shingle colors with the improved Timberline HDZ^® RS, the ultimate choice for reflective shingles. Its refreshed color options feature our enhance EcoDark^® granule technology. These shingles can be used to comply with the Cool Roof Requirements of Title 24 and the LA County Green Building Standards Code* while also enhancing the curb appeal of your home. Now, get GAF Time-Release Algae-Fighting Technology, with the 25-year StainGuard Plus™ Limited Warranty against blue-green algae discoloration¹, critical in hot, and coastal climates like California.