Patent attributes
A one piece shower drain pan, encapsulated in a water proof membrane, and the method of fabricating the one piece open drain shower pan, the method which includes providing extruded polystyrene (XPS) foam of the type which absorbs very little water; shaping the section of extruded polystyrene foam with a CNC router to obtain the desired slope in the floor; cutting a hole in the foam to produce the drain hole; cutting a curb from the XPS foam and gluing the foam to a pan base on the open sides. Splash walls are then cut from concrete wall board and glued to the sides having no curb, so that the glue serves as a bonding agent and provides a waterproof seal between the parts; after the glue has cured, spraying the entire pan assembly with a polyurethane or polyurea coating to completely encapsulate the entire pan with a waterproof membrane, which provides strength and rigidity and defines a one piece drain pan ready for installation.
