Is It Ok To Drill Holes In Floor Joist

If you have manufactured floor joists you will want to consult the particular manufacturer s literature.

Is it ok to drill holes in floor joist.

If you intend to drill any holes larger than 4 inches 100mm in diameter please first check with the joist supplier manufacturer. Keep holes 8 inches 203mm apart from each other if there are multiple holes in the joist. Do not drill holes within 6 inches 152mm from either end of the joists. Holes up to 4 in.

The diameter of holes shall not be greater than 1 3 the depth of the floor joists. Just stay 6 in. If you have manufactured i joists you can drill holes up to 1 1 2 in. In this case d is 7 and d 6 1 166inches or 1 3 16 maximum bore size.

Can be drilled in the middle of the i joist away from the ends and load bearing wall. But modern living requires electrical wiring and plumbing. Your proposed bore size for the holes exceeds the maximum diameter allowed by over 1 full inch and would not be allowed. In a perfect world floor joists are left whole to provide the greatest support.

As part of any new installation work or a re wire a cable trunking or cable tray sometimes has to pass through an element of building construction such as a floor wall or beam necessitating the formation of a notch or opening in the element. Holes cannot be closer than 2 to. Diameter almost anywhere in the web area the area between the flanges. For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches.

The maximum size a bored hole can be in a floor joist is no greater than d 6 where d equals the depth of the floor joist.