This is a cost effective alternative to our standard 3"+1" construction for applications that do not require thermal isolation. This construction offers a smooth interior and exterior finish. The inner panel system can be manufactured from G90 galvanized steel, mill finished aluminum, or stainless steel. The exterior can be made from stucco embossed aluminum, or factory pre-coated (available in a wide array of standard colors, as well as custom colors). Download the Standard Construction information sheet.