GAF Timberline HDZ shingles have an expected functional and aesthetic lifespan ranging between 25 and 30 years when installed correctly over a well-ventilated attic deck. GAF backs these shingles with its strong lifetime limited warranty framework. Achieving the upper end of this lifespan depends heavily on proper installation practices, balanced intake and exhaust attic ventilation, local climate severity, and regular maintenance to keep valleys clear of debris and organic growth.
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