Do not notch or drill holes through the top or bottom flange.
Is it ok to drill holes in engineered floor joist.
Of walls and rim joists.
In a perfect world floor joists are left whole to provide the greatest support.
Typically most manufacturers have little perforated knockout holes that can be punched out without the use of a drill.
For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches.
But modern living requires electrical wiring and plumbing.
Maximum hole size is one third of the joist depth.
Holes must be at least 2 in.
The diameter of holes shall not be greater than 1 3 the depth of the floor joists.
Holes cannot be closer than 2 to.
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.
Refer to the hole chart on page 9 of the tji specifiers guide for uniformly loaded joists.
It is generally permissible to drill up to 38mm holes anywhere in the web.
For simple span 5 minimum uniformly loaded joists meeting the requirements of this guide one maximum size round hole.
Away from the top and bottom.
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 the engineered i joists shown in fig 1 some of the limitations are.
Where and how to drill joists for electrical cables or.
From the top and bottom edges of a joist.
They do not affect hole placement.
Leave at least 1 4 in.
Sometimes joists are notched at the end where they bear on a wall or sill.
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 may be located vertically anywhere within the web.
Or the amount specified by the manufacturer of web between the edge of the hole and the flange.
If you have manufactured floor joists you will want to consult the particular manufacturer s literature.
Leave 1 8 of web minimum at top and bottom of hole.
Drill holes with a diameter of no more than one third the depth of the joist staying 2 in.
Area provided there are no other holes in the joist or notches along its top or bottom.
Holes anywhere in the web area of engineered i joists except within 6 in.
Drill large holes toward the center of i beam joists not toward the ends.
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.
