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Old 02-10-2014, 06:02 PM   #1
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Drilling Floor joist


What is the code for the size of hole drilled thru two overlapped joists directly above a support wall? I have two 2x8 joist overlapping directly above the support wall below, and I need to drill a 3-1/2" hole to move the drain line from a toilet from one joist space over to the next joist space (I can't go below the joists either). Can this be done, or is it against code?

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Old 02-10-2014, 06:55 PM   #2
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Drilling Floor joist


That would be a great question for framers (carpenters)

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Old 02-10-2014, 06:59 PM   #3
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Drilling Floor joist


We don't know what code you are under, since you failed to post location. Best is to check with your local building inspector.
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Old 02-10-2014, 07:00 PM   #4
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Drilling Floor joist


No, you can't drill above a bearing point.

To get more info, I'm moving your post to a different board.

BTW- welcome to DIY Chatroom
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Old 02-10-2014, 10:11 PM   #5
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Drilling Floor joist


Maximum; 1/3 depth of joist-- leaving 2" of solid wood above and below the hole; http://publicecodes.cyberregs.com/ic...9_5_par030.htm

http://publicecodes.cyberregs.com/ic...?bu2=undefined

Check locally with AHJ, though a State code would follow one or both the "I" codes stated.

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