Prepare the floor of bath room for tiling, by nailing 7/8-inch boards on cleats nailed to the sides of the beams. The top of the boards to be (5 inches) below the top of the adjoining floor. Bevel the beams on both sides to an edge on top.

Prepare the side walls for tiling by nailing 2X3-inch pieces horizontally between the studs, about 12 inches apart, to a height of 4 feet [for metal lathing].