That gives you a 5 1 4 in.
Is it ok to drill holes in engineered floor joist.
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.
But modern living requires electrical wiring and plumbing.
Sometimes joists are notched at the end where they bear on a wall or sill.
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.
Tradespeople often need to cut notches or holes in floor and ceiling joists to run pipes ductwork or wires.
The diameter of holes shall not be greater than 1 3 the depth of the floor joists.
How to drill a hole through the side of a floor joist.
Drill holes with a diameter of no more than one third the depth of the joist staying 2 in.
Maximum hole size is one third of the joist depth.
Knockouts are located in web at approximately 12 on center.
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.
Leave at least 1 4 in.
Holes anywhere in the web area of engineered i joists except within 6 in.
Holes cannot be closer than 2 to.
Do not notch or drill holes through the top or bottom flange.
Leave 1 8 of web minimum at top and bottom of hole.
For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches.
Typically most manufacturers have little perforated knockout holes that can be punched out without the use of a drill.
Area provided there are no other holes in the joist or notches along its top or bottom.
Away from the top and bottom.
Where and how to drill joists for electrical cables or.
Holes must be at least 2 in.
From the top and bottom edges of a joist.
Area in the middle of the 2 10 joist where the hole can go.
It is generally permissible to drill up to 38mm holes anywhere in the web.
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.
Or the amount specified by the manufacturer of web between the edge of the hole and the flange.
Of walls and rim joists.
Holes may be located vertically anywhere within the web.
If you have manufactured floor joists you will want to consult the particular manufacturer s literature.
For the engineered i joists shown in fig 1 some of the limitations are.
