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bossybill
rules on drilling thru wood floor joist

Are there rules on drilling thru wood floor joist:confused:

canuk
Re: rules on drilling thru wood floor joist

Aside from common sense there are definately rules set by the building codes regarding this.

Without reciting the code .... here is a summary :

Drilling and notching of standard wood members is subject to the following:

  • Notches in joists, rafters, and beams may not exceed one-sixth of the depth of the member, may not be longer than one-third of the depth of the member and may not be located in the middle third of the span.
  • Notches at the ends of a joist, rafter, or beam may not exceed one-fourth the depth of the member.
  • The diameter of holes bored or cut into joists, rafters, and beams may not exceed one-third the actual depth of the member. Holes may not be closer than 2 inches to the top or bottom of the member or any other hole located in the member. Where the member is also notched, the hole may be no closer than 2 inches to the notch.

Drilling and notching of open web trusses or laminated veneer lumber (LVL) beams is not permitted without an approved design from the truss manufacturer or a structural engineer.Drilling and notching of I-joists is permitted in accordance with the manufacturers written installation instructions. You should obtain a copy of these instructions before starting any work.
In this link scroll down to page 11 to show the specifications as to holes for this manufacturers guide :
http://www.ilevel.com/literature/TJ-4000.pdf

Hope this helps.:)

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