Is It Ok To Drill Holes In Engineered Floor Joist

Refer to the hole chart on page 9 of the tji specifiers guide for uniformly loaded joists.

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. For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches. For simple span 5 minimum uniformly loaded joists meeting the requirements of this guide one maximum size round hole. The diameter of holes shall not be greater than 1 3 the depth of the floor joists.

Holes anywhere in the web area of engineered i joists except within 6 in. In a perfect world floor joists are left whole to provide the greatest support. Where and how to drill joists for electrical cables or. But modern living requires electrical wiring and plumbing.

Area in the middle of the 2 10 joist where the hole can go. Typically most manufacturers have little perforated knockout holes that can be punched out without the use of a drill. 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. They do not affect hole placement.

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. Away from the top and bottom. How to drill a hole through the side of a floor joist. Or the amount specified by the manufacturer of web between the edge of the hole and the flange.

Drill holes with a diameter of no more than one third the depth of the joist staying 2 in. Holes must be at least 2 in. Leave at least 1 4 in. Leave 1 8 of web minimum at top and bottom of hole.

Do not notch or drill holes through the top or bottom flange. Of walls and rim joists. Drill large holes toward the center of i beam joists not toward the ends. If you have manufactured floor joists you will want to consult the particular manufacturer s literature.

Maximum hole size is one third of the joist depth. Sometimes joists are notched at the end where they bear on a wall or sill. For the engineered i joists shown in fig 1 some of the limitations are. From the top and bottom edges of a joist.

Area provided there are no other holes in the joist or notches along its top or bottom. That gives you a 5 1 4 in. Holes cannot be closer than 2 to. Holes may be located vertically anywhere within the web.