Toilet Drain Through Floor Joist

An important step in running drain lines occurs on paper before the actual plumbing begins.

Toilet drain through floor joist.

So your hole sizes will need to be a bit greater than that. Step 4 cut the holes. So if you ve got a 2x10 you ll be able to squeak a piece of 4 pipe through if you carefully centre it in the joists from top to bottom. How to install drain lines through the floor layout.

That s only 4 over 16 feet. The bigger hole you can drill on 2x10 it will be 1 inch and you need at least 4 try to build some how a bulk head downstairs if it is possible. Away from the top and bottom. Do not even think to drill a hole for your toilet drain on your floor joist.

Good luck with your project. If joists are 16 inches on center and pipes run across them at a right angle holes should differ in height by about 3 8 inch. Area provided there are no other holes in the joist or notches along its top or bottom. So just measure carefully to maintain the minimum slope following the joist manufacturer s rules and you ll be fine.

When you run your pipes through a joist you will have to be careful with your work. And you can cut holes in the joists within the permitted range. Area in the middle of the 2 10 joist where the hole can go. Drill holes with a diameter of no more than one third the depth of the joist staying 2 in.

Where and how to drill joists for electrical cables or plumbing runs depends on what type of floor framing you have. Although notches aren t allowed in the center third of a joist s length you can drill holes anywhere along the length of the floor joist in that 5 1 4 in. While plain water will drain with. 3 pipe is 3 1 2 od and 4 pipe is 4 5 od.

Well you only need an inch of drop for every four feet for a pipe 2 1 2 or smaller. And most abs toilet drain piping i ve seen is 4 not 3. The holes must follow a straight line across the floor and must ascend or descend so the pipe will be sloped 1 4 inch per foot. From the top and the bottom if it s a dimensional lumber joist.

A fall of 1 4 inch per lineal foot is the best slope for drainpipes. The slope should be about 1 4 for each foot of pipe. Mark where the overflow at the top. That gives you a 5 1 4 in.

The holes will have to follow a straight line that goes across the floor and has to either go up or go down so the pipe has a slope.