Able to withstand all weather conditions, DURAMAX Insulated Vinyl Buildings are built with durable insulated composite panels that will not rust, rot, or mildew. Fire retardant polyurethane insulation is sandwiched in between two steel panels—galvanized surface on the outside and smooth surface on the inside. Other features include: door with keyed lock, gutter system, and corrugated roof. Comes complete with foundation and window kits. Modular panels install quickly in just a few short hours. Ships unassembled.