Cutting Holes In Floor Joists For Plumbing

Rules for holes in joists.

Cutting holes in floor joists for plumbing.

Of solid wood between the top and bottom edges of the joist and the edges of any hole. Sometimes joists are notched at the end where they bear on a wall or sill. These joists may need reinforcin g to reduce bounciness sagging or excessive deflection in the floor or ceiling. Although notches aren t allowed in the center third of a joist s length you can drill holes anywhere along the length of the floor joist in that 5 1 4 in.

This is where the compressive and tensile load distribution is neutralised. From the top and the bottom if it s a dimensional lumber joist. Tradespeople often need to cut notches or holes in floor and ceiling joists to run pipes ductwork or wires. You also have to leave at least 2 in.

Check with the manufacturer as to the size of hole for the depth of joist rectangular holes are generally not permitted. Holes should only be drilled on the centre line of the joist. Drill holes with a diameter of no more than one third the depth of the joist staying 2 in. Never drill top to bottom through a joist.

Holes should have a diameter of no greater than 0 25 times the depth of the joist. These types of joists are engineered and their structural performance relies upon their integrity not being compromised. Where and how to drill joists for electrical cables or plumbing runs depends on what type of floor framing you have. Away from the top and bottom.

Area in the middle of the 2 10 joist where the hole can go. Holes should be no closer together than 3 times the. For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches. Minimum applies to all holes except knockouts closely grouped round holes are.

Keep the hole at least 2 in. Running wires or water supply lines through floor joists is a bit tricky but there is a way to cut the necessary openings through the joists safely. Scan horizontally until you intersect the cor rect hole size column. Area provided there are no other holes in the joist or notches along its top or bottom.

Measurement shown is minimum distance from edge of hole to support. Permitted if the group perimeter meets requirements for round or square holes. Minimum distance from table b 1 round holes may be cut anywhere in web outside of hatched zone if. That gives you a 5 1 4 in.

They are located 3 away horizontally edge to edge from a larger hole. Using table a table b or both if required determine the hole shape size and select the tji joist and depth. Where the property contains metal web joists as shown in fig 2 no notching drilling or cutting in either the timber flanges or the steel webs is permitted.