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Old 11-16-2009, 06:15 PM   #1
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Joist cutting for new bathroom


I am installing a new bathroom and have true (100 yo house) 2x10 joists with a 12' span and would need to cut three of these joists for the 3" waste. The cuts would be located roughly 18" from one end. Unfortunately I have a stained glass window directly below where the bathroom is to be located and my only option is to cut.
The joists are located on the first floor. The house is three stories and has a full basement.
Open to suggestions.

Last edited by SJERSEY; 11-16-2009 at 06:17 PM.
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Old 11-16-2009, 07:12 PM   #2
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Joist cutting for new bathroom


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Originally Posted by SJERSEY View Post
I am installing a new bathroom and have true (100 yo house) 2x10 joists with a 12' span and would need to cut three of these joists for the 3" waste. The cuts would be located roughly 18" from one end. Unfortunately I have a stained glass window directly below where the bathroom is to be located and my only option is to cut.
The joists are located on the first floor. The house is three stories and has a full basement.
Open to suggestions.
Why do you have tom cut them? Just drill through the three joists.
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Old 11-16-2009, 07:22 PM   #3
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Joist cutting for new bathroom


I can drill through the joists. The question more precisely is can I safely drill through these joist without compromising the integrity of the joist by drilling at the location mentioned. I will be drilling through less than 1/3 of the joist.
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Old 11-16-2009, 08:05 PM   #4
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Joist cutting for new bathroom


http://arch.umd.edu/Tech/Structural_..._Guide_A11.pdf
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Old 11-17-2009, 08:30 AM   #5
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Joist cutting for new bathroom


to run a 3" waste line, you'll need a 3-1/2" hole, if you are the best holesaw guy I've ever seen. More likely, you'll need a 4" hole. That is greater than 1/3 of your joist width, but not much. Personally, I'd run it and add some cladding to the joists.
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Old 11-17-2009, 08:57 AM   #6
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Joist cutting for new bathroom


Another alternative would be to box out the area and clear it from any framing members. Double up the surrounding framing and hang the cut joists with joist hangers.
This would depend on the situation you had and how it effected the structure. It doesn't mean you can do this in every situation. It would require a trained, onsite eye to advise.
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