Title: North Dallas GAF Timberline HDZ Roof Replacement Approximately 20 years after Bert Roofing installed the home’s original Elk laminated shingle roof, the homeowner called us back for its replacement. We installed GAF Timberline HDZ shingles in Weathered Wood, along with new chimney flashing, lead plumbing jacks and four turbine vents. The project is in North Dallas, 75248, near Hillcrest Road between Campbell and Arapaho.