Upgrading from standard GAF Timberline HDZ shingles to the ultra-premium UHDZ line typically increases total material and installation costs by roughly 15 to 30 percent, which generally adds an extra dollar to two dollars per square foot installed, depending on regional labor rates and roof complexity. This higher price point reflects the significantly heavier weight, advanced Class 4 impact resistance, and extra-thick profile of the UHDZ material.
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