Technical Specifications Features R-12 thermal resistance ? Thickness: 1 3⁄8" Polyurethane Insulation Galvanized steel (light woodgrain finish) Dura+ or Bolted Hardware ? Sizes Widths from 8’ to 18’, in 1” increments. Heights from 6’6” to 8’, in 3” increments. Plese contact us for more details on oversized doors available.