Is It Ok To Drill Holes In Engineered Floor Joist

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.

Is it ok to drill holes in engineered floor joist.

It is generally permissible to drill up to 38mm holes anywhere in the web. 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. 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.

Away from the top and bottom. But modern living requires electrical wiring and plumbing. That gives you a 5 1 4 in. For simple span 5 minimum uniformly loaded joists meeting the requirements of this guide one maximum size round hole.

Knockouts are located in web at approximately 12 on center. Holes anywhere in the web area of engineered i joists except within 6 in. Holes must be at least 2 in. 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. For the engineered i joists shown in fig 1 some of the limitations are. For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches. Or the amount specified by the manufacturer of web between the edge of the hole and the flange.

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. From the top and bottom edges of a joist. Sometimes joists are notched at the end where they bear on a wall or sill.

Leave 1 8 of web minimum at top and bottom of hole. In a perfect world floor joists are left whole to provide the greatest support. How to drill a hole through the side of a floor joist. Maximum hole size is one third of the joist depth.

The diameter of holes shall not be greater than 1 3 the depth of the floor joists. Drill large holes toward the center of i beam joists not toward the ends. Do not notch or drill holes through the top or bottom flange. Holes cannot be closer than 2 to.

Leave at least 1 4 in. Holes may be located vertically anywhere within the web. Of walls and rim joists. Typically most manufacturers have little perforated knockout holes that can be punched out without the use of a drill.