Is It Ok To Drill Holes In Floor Joist

Holes up to 4 in.

Is it ok to drill holes in floor joist.

How to drill a hole through the side of a floor joist. Your proposed bore size for the holes exceeds the maximum diameter allowed by over 1 full inch and would not be allowed. 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. Away from any end or load bearing wall second photo.

If you have manufactured i joists you can drill holes up to 1 1 2 in. In a perfect world floor joists are left whole to provide the greatest support. Just stay 6 in. If you intend to drill any holes larger than 4 inches 100mm in diameter please first check with the joist supplier manufacturer.

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. Do not drill holes within 6 inches 152mm from either end of the joists. Keep holes 8 inches 203mm apart from each other if there are multiple holes in the joist. But modern living requires electrical wiring and plumbing.

Holes cannot be closer than 2 to. Cutting notches and drilling holes in joists. Diameter almost anywhere in the web area the area between the flanges. Can be drilled in the middle of the i joist away from the ends and load bearing wall.

For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches.