Is It Ok To Drill Holes In Engineered Floor Joist

Or the amount specified by the manufacturer of web between the edge of the hole and the flange.

Is it ok to drill holes in engineered floor joist. For the engineered i joists shown in fig 1 some of the limitations are. Sometimes joists are notched at the end where they bear on a wall or sill. If you have manufactured floor joists you will want to consult the particular manufacturer s literature. Refer to the hole chart on page 9 of the tji specifiers guide for uniformly loaded joists.

Holes cannot be closer than 2 to. It is generally permissible to drill up to 38mm holes anywhere in the web. Maximum hole size is one third of the joist depth. In a perfect world floor joists are left whole to provide the greatest support.

They do not affect hole placement. But modern living requires electrical wiring and plumbing. Area provided there are no other holes in the joist or notches along its top or bottom. Area in the middle of the 2 10 joist where the hole can go.

How to drill a hole through the side of a floor joist. 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. Away from the top and bottom.

That gives you a 5 1 4 in. Holes must be at least 2 in. Leave 1 8 of web minimum at top and bottom of hole. Of walls and rim joists.

Leave at least 1 4 in. From the top and bottom edges of a joist. For simple span 5 minimum uniformly loaded joists meeting the requirements of this guide one maximum size round hole. Drill large holes toward the center of i beam joists not toward the ends.

Knockouts are located in web at approximately 12 on center. Tradespeople often need to cut notches or holes in floor and ceiling joists to run pipes ductwork or wires. 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. Often hole size can be increased and holes can be placed closer to bearing than shown on the chart based on actual design spans and loads.

The diameter of holes shall not be greater than 1 3 the depth of the floor joists. If the cut outs are too large or in the wrong location the joist can be weakened and unable to support the load it was designed for. Typically most manufacturers have little perforated knockout holes that can be punched out without the use of a drill. Holes anywhere in the web area of engineered i joists except within 6 in.