Running Plumbing Through Floor Joists

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

Running plumbing through floor joists.

Step 3 understand the joist slopes. Step 4 cut the holes. So i have to go through. Discussion in plumbers talk started by.

I will have to run my new tub drain in our 2nd floor bathroom through the joists. In the case of your 2 10 joists the maximum diameter is 35 64 in. You also have to leave at least 2 in. An important step in running drain lines occurs on paper before the actual plumbing begins.

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. Waste pipes through joists. That gives you a 5 1 4 in. 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.

Diameter plenty big enough for running cable. 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. The floor will need cutting out to accommodate the trap but the pipe will be above floor level or. The hole cannot be larger than one third the depth of the joist so the maximum hole size for a 2 12 joist actual size 1 1 2 x 11 1 4 in is 3 3 4 in.

Use our calculator to ensure your holes and notches are in the right position and do not affect the structural integrity of the building. Area in the middle of the 2 10. Notches can t be deeper than one sixth of the joist depth. Joists to get a waste out the other needed the tray to be kept as low as possible due to the elderly client.

You can drill the holes anywhere along the length of the joist first photo. With the joists running parallel to the. 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. Lean how to notch a joist for pipes and cables if you need to run pipes or cables under a floor.

Of solid wood between the top and bottom edges of the joist and the edges of any hole. When you run your pipes through a joist you will have to be careful with your work.