Truly unique in style and construction, the Advantage CH stands apart from the crowd. The 3-section high design maximizes the glass area, and the 6-panels across accentuate the vertical appearance of the door. Construction consists of three layers: a 1-3/8" thick polystyrene core sandwiched between two 26-gauge pre-finished steel skins. The steel is protected by a G60 galvanizing layer topped by a heavy duty two-coat baked-on polyester paint system. The rated R-value is 6.3.