For the engineered i joists shown in fig 1 some of the limitations are.
Is it ok to drill holes in engineered floor joist.
Away from the top and bottom.
Holes anywhere in the web area of engineered i joists except within 6 in.
Do not notch or drill holes through the top or bottom flange.
In a perfect world floor joists are left whole to provide the greatest support.
Refer to the hole chart on page 9 of the tji specifiers guide for uniformly loaded joists.
Maximum hole size is one third of the joist depth.
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.
Drill large holes toward the center of i beam joists not toward the ends.
Of walls and rim joists.
Tradespeople often need to cut notches or holes in floor and ceiling joists to run pipes ductwork or wires.
From the top and bottom edges of a joist.
Holes must be at least 2 in.
Leave 1 8 of web minimum at top and bottom of hole.
Leave at least 1 4 in.
If you have manufactured floor joists you will want to consult the particular manufacturer s literature.
Where and how to drill joists for electrical cables or.
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.
Holes cannot be closer than 2 to.
For simple span 5 minimum uniformly loaded joists meeting the requirements of this guide one maximum size round hole.
Drill holes with a diameter of no more than one third the depth of the joist staying 2 in.
Knockouts are located in web at approximately 12 on center.
Or the amount specified by the manufacturer of web between the edge of the hole and the flange.
Holes may be located vertically anywhere within the web.
Sometimes joists are notched at the end where they bear on a wall or sill.
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.
For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches.
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.
Area provided there are no other holes in the joist or notches along its top or bottom.
The diameter of holes shall not be greater than 1 3 the depth of the floor joists.
It is generally permissible to drill up to 38mm holes anywhere in the web.
They do not affect hole placement.
