Pre-cast stall shower panel assembly

A shower assembly comprising a horizontal base having upstanding panel supports around the perimeter of said base, a vertical back backing panel, opposed vertical side backing panels perpendicular to opposed edges of said back backing panel, corners on the sides of said side backing panels, said corners having first and second corner backing panels perpendicular to each other, external vertical ribs on said back and side backing panels and on said corner backing panels, said ribs having upper and lower edges first means securing the lower edges of said external vertical ribs to said panel supports, said back, side and corner panels each having opposed vertical edges and upper and lower ends, second means engaging the adjacent vertical edges of said back, side and corner backing panels to each other, third means securing the upper edges of said vertical ribs, the adjacent edges of one pair of second corner backing panels being spaced apart to provide an entrance opening for the shower, curb means between said second corner backing panels on said base at the bottom of said entrance opening, header means between the upper ends of said second corner backing panels, and tiles lining the upper surface of said base and the interior surfaces of said back and side backing panels and said corner backing panels.