Is It Ok To Drill Holes In Floor Joist

Keep holes 8 inches 203mm apart from each other if there are multiple holes in the joist.

Is it ok to drill holes in floor joist.

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. 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.

Your proposed bore size for the holes exceeds the maximum diameter allowed by over 1 full inch and would not be allowed. How to drill a hole through the side of a floor joist. 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.

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

Holes cannot be closer than 2 to. If you intend to drill any holes larger than 4 inches 100mm in diameter please first check with the joist supplier manufacturer. In this case d is 7 and d 6 1 166inches or 1 3 16 maximum bore size. For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches.

If you have manufactured i joists you can drill holes up to 1 1 2 in.