Please follow these rules for making holes in joists.
Cutting holes in floor joists.
They are located 3 away horizontally edge to edge from a larger hole.
As part of any new installation work or a re wire a cable trunking or cable tray sometimes has to pass through an element of building construction such as a floor wall or beam necessitating the formation of a notch or opening in the element.
Of walls and rim joists.
Holes anywhere in the web area of engineered i joists except within 6 in.
A hole saw is a short tube shaped cutting tool with drill bit through the center of the cylinder and a.
Minimum applies to all holes except knockouts closely grouped round holes are.
Tradespeople often need to cut notches or holes in floor and ceiling joists to run pipes ductwork or wires.
Trus joist tji joists.
Permitted if the group perimeter meets.
If you have manufactured floor joists you will want to consult the particular manufacturer s literature.
For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches.
Drill holes with a diameter of no more than one third the depth of the joist staying 2 in.
Holes cannot be closer than 2 to.
The diameter of holes shall not be greater than 1 3 the depth of the floor joists.
Cutting and or removing joists to provide an entry or access can be the most difficult part of the overall project.
Away from the top and bottom.
Where and how to drill joists for electrical cables or.
Cutting notches and drilling holes in joists.
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.
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.
The rules for positioning notches in floor joists image courtesy of niceic to understand the forces at work in a joist particularly the tension and compression forces please see our project that explains how the forces that affect buildings work.
Rules for holes in joists.
Refer to the hole chart on page 9 of the tji specifiers guide for uniformly loaded joists.
Sometimes joists are notched at the end where they bear on a wall or sill.
