Cutting Holes In Floor Joists For Plumbing

Minimum distance from table b 1 round holes may be cut anywhere in web outside of hatched zone if.

Cutting holes in floor joists for plumbing. Minimum applies to all holes except knockouts closely grouped round holes are. These types of joists are engineered and their structural performance relies upon their integrity not being compromised. Rules for holes in joists. 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.

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. Permitted if the group perimeter meets requirements for round or square holes. Area in the middle of the 2 10 joist where the hole can go. Drill holes with a diameter of no more than one third the depth of the joist staying 2 in.

For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches. Never drill top to bottom through a joist. Scan horizontally until you intersect the cor rect hole size column. Keep the hole at least 2 in.

This is where the compressive and tensile load distribution is neutralised. Measurement shown is minimum distance from edge of hole to support. Holes should have a diameter of no greater than 0 25 times the depth of the joist. Check with the manufacturer as to the size of hole for the depth of joist rectangular holes are generally not permitted.

From the top and the bottom if it s a dimensional lumber joist. The diameter of holes shall not be greater than 1 3 the depth of the floor joists. That gives you a 5 1 4 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.

Sometimes joists are notched at the end where they bear on a wall or sill. Holes should only be drilled on the centre line of the joist. These joists may need reinforcin g to reduce bounciness sagging or excessive deflection in the floor or ceiling. You also have to leave at least 2 in.

Area provided there are no other holes in the joist or notches along its top or bottom. Using table a table b or both if required determine the hole shape size and select the tji joist and depth. Of solid wood between the top and bottom edges of the joist and the edges of any hole. Holes cannot be closer than 2 to the bottom or top of a joist or to another hole or notch in the joist drilling floor joists.

Where and how to drill joists for electrical cables or plumbing runs depends on what type of floor framing you have. Holes should be no closer together than 3 times the. They are located 3 away horizontally edge to edge from a larger hole.