Toilet Drain Through Floor Joist

Drill holes with a diameter of no more than one third the depth of the joist staying 2 in.

Toilet drain through floor joist.

That gives you a 5 1 4 in. Step 4 cut the holes. 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.

Away from the top and bottom. Well you only need an inch of drop for every four feet for a pipe 2 1 2 or smaller. So just measure carefully to maintain the minimum slope following the joist manufacturer s rules and you ll be fine. So your hole sizes will need to be a bit greater than that.

While plain water will drain with. That s only 4 over 16 feet. Mark where the overflow at the top. A fall of 1 4 inch per lineal foot is the best slope for drainpipes.

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. From the top and the bottom if it s a dimensional lumber joist. 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. When you run your pipes through a joist you will have to be careful with your work.

How to install drain lines through the floor layout. Do not even think to drill a hole for your toilet drain on your floor joist. And you can cut holes in the joists within the permitted range. Good luck with your project.

Area in the middle of the 2 10 joist where the hole can go. Area provided there are no other holes in the joist or notches along its top or bottom. The slope should be about 1 4 for each foot of pipe. 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.

Keep the hole at least 2 in. 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. 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. 3 pipe is 3 1 2 od and 4 pipe is 4 5 od.

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