Toilet Drain Through Floor Joist

And most abs toilet drain piping i ve seen is 4 not 3.

Toilet drain through floor joist.

Running drainpipe through joists calls for meticulous work. A fall of 1 4 inch per lineal foot is the best slope for drainpipes. While plain water will drain with. Area provided there are no other holes in the joist or notches along its top or bottom.

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. The slope should be about 1 4 for each foot of pipe. Where and how to drill joists for electrical cables or plumbing runs depends on what type of floor framing you have. That s only 4 over 16 feet.

Good luck with your project. 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. When you run your pipes through a joist you will have to be careful with your work. 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.

Keep the hole at least 2 in. So your hole sizes will need to be a bit greater than that. Mark the area of the tub footprint on the subfloor with crosses at each corner if it differs from that of the removed bathtub or if you are relocating the tub. That gives you a 5 1 4 in.

Drill holes with a diameter of no more than one third the depth of the joist staying 2 in. Step 4 cut the holes. 3 pipe is 3 1 2 od and 4 pipe is 4 5 od. So just measure carefully to maintain the minimum slope following the joist manufacturer s rules and you ll be fine.

Mark where the overflow at the top. And you can cut holes in the joists within the permitted range. Away from the top and bottom. Area in the middle of the 2 10 joist where the hole can go.

Well you only need an inch of drop for every four feet for a pipe 2 1 2 or smaller. From the top and the bottom if it s a dimensional lumber joist. 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. Do not even think to drill a hole for your toilet drain on your floor joist.

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.