Is It Ok To Drill Holes In Engineered Floor Joist

From the top and bottom edges of a joist.

Is it ok to drill holes in engineered floor joist.

Tradespeople often need to cut notches or holes in floor and ceiling joists to run pipes ductwork or wires. That gives you a 5 1 4 in. Where and how to drill joists for electrical cables or. Knockouts are located in web at approximately 12 on center.

For the engineered i joists shown in fig 1 some of the limitations are. The diameter of holes shall not be greater than 1 3 the depth of the floor joists. How to drill a hole through the side of a floor joist. Holes must be at least 2 in.

Or the amount specified by the manufacturer of web between the edge of the hole and the flange. In a perfect world floor joists are left whole to provide the greatest support. It is generally permissible to drill up to 38mm holes anywhere in the web. Typically most manufacturers have little perforated knockout holes that can be punched out without the use of a drill.

Away from the top and bottom. Holes anywhere in the web area of engineered i joists except within 6 in. If you have manufactured floor joists you will want to consult the particular manufacturer s literature. Sometimes joists are notched at the end where they bear on a wall or sill.

Holes cannot be closer than 2 to. Refer to the hole chart on page 9 of the tji specifiers guide for uniformly loaded joists. But modern living requires electrical wiring and plumbing. For simple span 5 minimum uniformly loaded joists meeting the requirements of this guide one maximum size round hole.

Holes may be located vertically anywhere within the web. 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. Drill holes with a diameter of no more than one third the depth of the joist staying 2 in. Area in the middle of the 2 10 joist where the hole can go.

Of walls and rim joists. For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches. Maximum hole size is one third of the joist depth. Drill large holes toward the center of i beam joists not toward the ends.

They do not affect hole placement. 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. Area provided there are no other holes in the joist or notches along its top or bottom. Leave at least 1 4 in.