The Tri Tech is at the top end of our Therma Tech line of insulated raised steel panel steel doors with an R 16 insulating value. It uses high density polystyrene in its 3" thick sandwich construction and features a flexible joint seal and natural Thermal Break. Four wood grain textured panel designs are available: Contemporary Flush (Model 608), Traditional Panel or short raised panel (Model 618), Ranch Panel or long raised panel (Model 628) and Carriage Panel (Model 60C). Doors are hot-dipped galvanized, primed then pre-painted in one of four standard colors: Bright White, Almond, Sandstone, and Brown. Our Carriage Panel is now available in a Dark and Medium Woodgrain finish. Choose from a wide selection of window designs.