Our assembled Tops are made to withstand even the harshest of weather conditions. We cut out a rabbet around the top rim and glue and nail 3/8" plywood into the rabbet. Coupling this construction with the Brushy Mtn. Rabbet joint on each corner makes this the strongest Top available. We cover our Tops with aluminum and fold, not notch the corners to ensure they will be waterproof and not rust. All tops come fully assembled.