Upgrading from standard GAF Timberline HDZ shingles to the ultra-premium UHDZ line typically increases material costs by roughly 15 to 30 percent, translating to an extra dollar or two per square foot installed, depending on regional labor rates. The higher price of UHDZ reflects its significantly thicker profile (appearing about 10% to 20% thicker with deeper shadow lines), a Class 4 impact resistance rating, and an extended 30-year algae warranty.
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