Is It Ok To Drill Holes In Floor Joist

How to drill a hole through the side of a floor joist.

Is it ok to drill holes in floor joist.

Cutting notches and drilling holes in joists. Holes up to 4 in. 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. Keep holes 8 inches 203mm apart from each other if there are multiple holes in the joist.

Away from any end or load bearing wall second photo. Your proposed bore size for the holes exceeds the maximum diameter allowed by over 1 full inch and would not be allowed. 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.

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. In a perfect world floor joists are left whole to provide the greatest support. But modern living requires electrical wiring and plumbing.

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. The diameter of holes shall not be greater than 1 3 the depth of the floor joists. Do not drill holes within 6 inches 152mm from either end of the joists.

Just stay 6 in.