Build a curb at the shower entrance out of two or three 2 x 4-inch boards stacked flat and fastened together and to the subfloor with screws or nails. Use 2 x 4-inch boards to box in the pan form. A rubber or vinyl membrane is placed over the curb and inside the form and runs up the walls of the shower at least 8 inches, where it is fastened with large-head nails.
Set the drain into the floor. Cut out the opening for the drain in the membrane, install the drain plate, and screw on the drain cover to a height if about 1 1/4 inches. Mix a stiff but wet batch of concrete, and float it in, slopping down from the walls of the shower to the level of the drain cover, ensuring at least a 1/4 inch of drop for every linear foot. Trowel or float concrete over the curb, using wire lath on the curb to hold the concrete if needed.
Smooth the concrete, and allow it to cure according to the manufacturer's instructions. Unscrew the drain cover, tile the shower pan, and replace the drain cover.Learn more about Home Maintenance