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Old 03-09-2010, 06:19 PM   #1
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shower waste

i have 6 x 2 inch joist Can any one let me know the largest hole i can drill in these joists


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Old 03-09-2010, 06:53 PM   #2
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you really shouldnt go more than an 1 1/2 inches does the joist just support the sheetrock on the cielling?


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Old 03-09-2010, 09:58 PM   #3
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Maximum 1/3 the depth of the joist is the rule. But, you're also required to leave 2" of wood above and below the hole. 1-1/2" is the largest hole that stands a chance of meeting that requirement, and that is a mighty big hole for such a small joist.

More information about the structure and what you're trying to accomplish would go a long way toward helping us help you out.
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