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  1. #1
    Join Date
    Dec 2007
    Posts
    1

    Default rules on drilling thru wood floor joist

    Are there rules on drilling thru wood floor joist

  2. #2
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default 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.
    Last edited by canuk; 12-26-2007 at 09:53 AM.

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