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.

Is it ok to drill holes in floor joist.

Your proposed bore size for the holes exceeds the maximum diameter allowed by over 1 full inch and would not be allowed. If you have manufactured i joists you can drill holes up to 1 1 2 in. Holes up to 4 in. But modern living requires electrical wiring and plumbing.

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. In a perfect world floor joists are left whole to provide the greatest support. Do not drill holes within 6 inches 152mm from either end of the joists. Just stay 6 in.

For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches. 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. Cutting notches and drilling holes in joists.

How to drill a hole through the side of a floor joist. 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. The diameter of holes shall not be greater than 1 3 the depth of the floor joists. Away from any end or load bearing wall second photo.

Holes cannot be closer than 2 to.