For a floor drain to serve its purpose, the floor’s surface must slant toward the drain. To slope a ceramic tile floor, you must prepare the floor before installing the tiles. Create a mud bed as the tiling surface above your subfloor to provide the necessary slope.
The mud bed is simply a mix of sand and cement that you can shape as needed. Once the mud bed is completed, you can install the ceramic tiles and the drain with the proper slope in place to direct the flow of water across your finished floor.
1. Clean the surface of your floor with a pH-neutral cleanser, using a mop to scrub away any dirt or debris. Rinse the floor with clean water after mopping it, and then allow it to dry for two to three hours.
2. Add a slight texture to the floor surface with a floor sander over wooden floors or a concrete grinder if subfloors are concrete. Run the machine over the floor once to create a slightly roughened surface for better adherence of the mud bed materials. Use a broom to sweep debris from the floor.
3. Use a hacksaw to cut a 3-inch length of PVC pipe of the same diameter as the drain. Place the pipe over the drain to protect it and mark its location.
4. Place a layer of roofing felt over the floor. Roll the felt out in rows, with the edge of each new row overlapping the previous row by four inches. Cut the felt paper to fit, using a utility knife. Use staples spaced every six inches across the felt to secure the felt to a wooden subfloor.
Secure the felt to a concrete subfloor using asphalt mastic under the felt. Spread the mastic with a steel trowel. Cut the felt around the PVC drain marker, and work around the marker placement.
5. Place metal lath over the felt. Use a two-inch overlap between lath pieces, and cut the lath as needed, using tin snips. Staple the lath to wooden subfloors with six-inch spacing between the staples.