In a perfect world floor joists are left whole to provide the greatest support.
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.
Area in the middle of the 2 10 joist where the hole can go.
They do not affect hole placement.
If you have manufactured floor joists you will want to consult the particular manufacturer s literature.
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.
Of walls and rim joists.
From the top and bottom edges of a joist.
Knockouts are located in web at approximately 12 on center.
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.
Where and how to drill joists for electrical cables or.
It is generally permissible to drill up to 38mm holes anywhere in 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.
Tradespeople often need to cut notches or holes in floor and ceiling joists to run pipes ductwork or wires.
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.
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.
Typically most manufacturers have little perforated knockout holes that can be punched out without the use of a drill.
Holes must be at least 2 in.
Holes may be located vertically anywhere within the web.
Leave at least 1 4 in.
Sometimes joists are notched at the end where they bear on a wall or sill.
For simple span 5 minimum uniformly loaded joists meeting the requirements of this guide one maximum size round hole.
Maximum hole size is one third of the joist depth.
Do not notch or drill holes through the top or bottom flange.
Or the amount specified by the manufacturer of web between the edge of the hole and the flange.
That gives you a 5 1 4 in.
Holes cannot be closer than 2 to.
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.
Holes anywhere in the web area of engineered i joists except within 6 in.
How to drill a hole through the side of a floor joist.
