Running Plumbing Through Floor Joists

Calculate the size and location of notches and holes in joists correctly.

Running plumbing through floor joists.

Discussion in plumbers talk started by. That gives you a 5 1 4 in. Joists to get a waste out the other needed the tray to be kept as low as possible due to the elderly client. 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.

An important step in running drain lines occurs on paper before the actual plumbing begins. I will have to run my new tub drain in our 2nd floor bathroom through the joists. With the joists running parallel to the. You can drill the holes anywhere along the length of the joist first photo.

Notches can t be deeper than one sixth of the joist depth. Diameter plenty big enough for running cable. Running drainpipe through joists calls for meticulous work. The slope should be about 1 4 for each foot of pipe.

Step 3 understand the joist slopes. Step 4 cut the holes. Of solid wood between the top and bottom edges of the joist and the edges of any hole. So i have to go through.

Use our calculator to ensure your holes and notches are in the right position and do not affect the structural integrity of the building. The kitchen had a low less than 8 feet ceiling to begin with and the sistering that we recently did with larger lumber took even more headroom away so i can t run the drain line below them. You also have to leave at least 2 in. Area in the middle of the 2 10.

During the layout stage plan to run the drainpipes parallel to the floor joists when possible. 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. Waste pipes through joists. In the case of your 2 10 joists the maximum diameter is 35 64 in.

When you run your pipes through a joist you will have to be careful with your work. Lean how to notch a joist for pipes and cables if you need to run pipes or cables under a floor.