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Can I drill a 4" hole in 2" x 10" floor joists 3' 6" from end of wall? I'm located in Ontario Canada if this is relevant.

Steven
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  • I assume you mean a hole in the middle of the joist, right? This link claims 3-3/4 inches max hole for a 2x12 joist: https://www.familyhandyman.com/floor/how-to-drill-through-floor-joists/view-all – Jim Stewart May 22 '17 at 20:40

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