The primary differences between GAF Timberline HDZ and UHDZ shingles lie in their thickness, weight, impact resistance rating, and aesthetic profile. HDZ is North America's top-selling architectural shingle featuring LayerLock technology and a Class 3 impact rating. UHDZ is an ultra-premium tier that is significantly thicker and heavier, incorporating proprietary UltraMat fiberglass core technology that earns it a UL 2218 Class 4 impact rating, deeper dual shadow lines, and extended algae warranties.
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