Building a bathroom in the basement means constructing a wet wall. This is not a difficult project in technique, but it is quite labor intensive with the removing of concrete and digging a trench for the drain pipe. In Part 1 of this series, you planned out your wall and got the project started by digging the trench for your drain pipe. In Part 2, you will start the wet wall itself through installing the piping and framing the wall.
Step 1: Install Plumbing from Drain
Starting at the main drain pipe, you will need to cut into it for installing a 'T' section for branching off your wet wall drain. Use the hacksaw and cut out a section large enough for the coupling. Clean off each of the pieces with the PVC cleaner and apply the glue to the outside of the drain line and the inside of the coupling. Attach together and position opening towards trench to wet wall.
Step 2: Lay Pipe to Wet Wall
Once you have the coupling in place you can then lay out the rest of the PVC pipe, Dry fit the pieces together so you can make any cuts that are needed and know where to place the elbows and other couplings. Place wooden stakes on each side to give them the proper slope along the floor. Remember the ¼-inch slope for each foot.
Step 3: Cement Pipe
After you have made all the adjustments to the pipes and venting, use the cleaner and the PVC cement and secure each section. Make sure that you leave an opening near the wet wall where it will be along a stud so you can secure it.
Step 4: Build Stud Framed Wall
With basic 2x4-inch framing techniques you can now build your wet wall. You will need to use a top and bottom plate. The bottom plate should be secured with masonry nails. You will also need to use a plate that is in two parts to make the space necessary for the drain pipe.
Step 5: Drill Holes in Studs
In order for the drain pipes to travel to the fixtures in your basement bathroom you will need to drill holes into the studs. These holes should not be much larger than the drain pipe. Use a drill with a hole saw attached to it and drill out the hole in the center of the stud. Remember to measure each stud to keep a standard slope to the piping.
Step 6: Install Water Supply Lines
Determine the closes hot and cold supply lines to the wet all and install a shut off valve at that point. Run new copper piping to the wall. Drill small holes for the pipe to extend through. Nail in some protective coverings in the hole and secure the piping to where the fixtures will be located. Use some flux onto the end of the pipe sections and heat with a torch. Once it is heated, touch with some solder to seal the pipe.