Cutting Holes In Floor Joists For Plumbing

Lean how to notch a joist for pipes and cables if you need to run pipes or cables under a floor.

Cutting holes in floor joists for plumbing. The diameter of holes shall not be greater than 1 3 the depth of the floor joists. Drill holes with a diameter of no more than one third the depth of the joist staying 2 in. Of walls and rim joists. Sometimes joists are notched at the end where they bear on a wall or sill.

The maximum allowable diameter of a hole in any solid lumber joist is one third of. For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches. Holes cannot be closer than 2 to. Engineered floor joists can be drilled only according to their manufacturer s guidelines the code specifies the maximum size of the holes you can drill or the notches you can cut where you can and can t place them and how far apart they can be spaced.

If the cut outs are too large or in the wrong location the joist can be weakened and unable to support the load it was designed for. Away from the top and bottom. Structural floor joist repairs. Where and how to drill joists for electrical cables or.

Holes anywhere in the web area of engineered i joists except within 6 in. As a remodeling contractor and carpenter one common structural framing issue i see alot of in bathroom remodeling jobs are floor joists that were cut drilled notched or need to be cut out to accommodate plumbing pipes and drains. If you have manufactured floor joists you will want to consult the particular manufacturer s literature.