The main differences between Timberline HDZ and Ultra HDZ (UHDZ) are thickness, weight, and impact resistance. UHDZ shingles are substantially thicker, heavier, and incorporate proprietary UltraMat high-performance fiberglass core technology that gives them a UL 2218 Class 4 impact resistance rating, whereas standard HDZ carries a Class 3 rating. UHDZ also features deeper dual shadow lines for an enhanced wood-shake look and extended algae protection.
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