Timberline HDZ are fiberglass asphalt shingles that were developed to have a dimensional design. They feature GAF’s proprietary color blends and enhanced shadow effect for a wood-shake style look. Timberline’s Dura Grip™ sealant paired with the smooth microgranule surface of the StrikeZone™ nailing area for fast tack and an asphalt-to asphalt monolithic cured bond provides strength, durability, and exceptional performance against wind uplift.