- For most building codes, your toilet drainpipe should be three to four inches in diameter and slope toward the pipe stack at 1/8 inch to ¼ inch per foot.
Toilet drainpipes used to be cast iron, but that material is expensive and difficult to work with. ABS or PVC pipe is durable, able to handle wastewater, less expensive and easier to work with than cast iron, so these materials are appropriate choices for your toilet drainpipe material. - The stack of pipes that you hook one end of your toilet's drainpipe to is your home's existing drain line, which will already be in the floor of your home. One part of the toilet drainpipe is a straight pipe that will connect with the "closet bend," or the "U" shaped pipe that goes in your floor, and connects with the pipe stack. You may need a "T" pipe to connect this pipe to your pipe stack.
- Once your drainpipe is connected to the pipe stack, it should come up perpendicular to your floor. Ideally, it will be about 12 inches away from the back wall so that the average toilet will be the appropriate distance from the wall. If your floor isn't yet finished, try to bring the drainpipe up through the floor in between joists so that the toilet will sit on the joists when it is installed, ensuring it has proper support.
The drainpipe doesn't directly connect with the toilet, and you'll need to trim the pipe so that it's flush with the floor after you've connected it to the pipe stack. Use a wax ring to create a seal between the bottom of the toilet and the pipe.
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