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  1. #1
    Join Date
    Jun 2008
    Location
    Reading, PA
    Posts
    4

    Default drilling thru floor joist

    So for a 2 by 8 floor joist, what is the largest hole you are allowed to drill through it, and do they make flat bracing for larger holes(ie, more of joist removed)?

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

    Default Re: drilling thru floor joist

    Holes can't be larger than 1/3 the depth of the member and not closer than 2 inches to the top or bottom of the member.

    So for a 2x8 that equates to a hole of 2.5 ( 2.49) inches.

    Here's a thread that discusses this issue: http://advice.thisoldhouse.com/showthread.php?t=5798
    "" an ounce of perception -- a pound of obscure "
    - Rush

  3. #3
    Join Date
    Jun 2008
    Location
    Reading, PA
    Posts
    4

    Default Re: drilling thru floor joist

    Quote Originally Posted by canuk View Post
    Holes can't be larger than 1/3 the depth of the member and not closer than 2 inches to the top or bottom of the member.

    So for a 2x8 that equates to a hole of 2.5 ( 2.49) inches.

    Here's a thread that discusses this issue: http://advice.thisoldhouse.com/showthread.php?t=5798


    Thank you, CANUK!!

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