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Old 10-14-2016, 04:32 PM   #1
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Add-on bathroom rough plumbing remodel


I'm remodeling my 1st floor bathroom and looking for advice on the rough plumbing. There use to be a toilet at left rear of the room, and a shower in the right center. I'd like to place the new toilet where the shower previously was, and in the left rear corner we'd like to add a sink. My biggest question is about the new toilet's return line. I only have access to the joist the current return line is in and the two to the right (stairs are in the way of the joists furthest to the right). I worry about the integrity of the floor joists if I cut a hole that large through boards.

FYI this bathroom is a former back porch, so underneath the joists are about 3' gap before the outside ground.

Any suggestions to relieve this problem? Any other issues anyone thinks I'm missing?
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Old 10-14-2016, 07:18 PM   #2
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Re: Add-on bathroom rough plumbing remodel


What state /country do you live in? For code reasons. Please post a measurement of the diameter of the joist.
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Old 10-18-2016, 03:50 PM   #3
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Re: Add-on bathroom rough plumbing remodel


I live in Madison, Wisconsin.

The joists are 7" tall.
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Old 10-18-2016, 07:30 PM   #4
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Re: Add-on bathroom rough plumbing remodel


I hate to bail on you but I do not know the plumbing code there. Perhaps a UPC code plumber could help you out.
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Old 10-18-2016, 07:43 PM   #5
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Re: Add-on bathroom rough plumbing remodel


It looks to me like the existing toilet drain enters the room from the doorway where the pictures are taken from.
Can it be cut off under the doorway and extended back to the end bay?
Then it will not require cutting or drill of those 2x8 joists.
The sink drain could use the existing holes to connect back into the new main run, I think.
Not sure if the vent stack would need to move, either, since I am not a Plumber and not from your area.
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