Patent ID: 8181286

Claim:
A prefabricated, polyurethane reaction injection molded, leak-proof shower module suitable for use in constructing a tiled shower, the shower module comprising: a floor having an upper surface, a lower surface, and a plurality of peripheral edges, wherein the floor is bounded along at least one peripheral edge by at least one sidewall, the at least one sidewall extending substantially vertically from the at least one peripheral edge, and wherein the floor slopes toward at least one drain wall defining a drain aperture at a pitch equal to or greater than ⅛ inch per foot; the drain aperture having a diameter of at least one inch; wherein the drain wall is either enclosed within a prefabricated drain assembly integrated into the floor or integrated directly into the floor and drain wall; and a drain reinforcing structure attached to the drain wall, the drain reinforcing structure embedded in an intermediary position between the upper surface and the lower surface of the floor of the module and laying in a plane which is substantially parallel to either or both of the upper surface and the lower surface of the floor of the module.