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Thread: Remodel Q: swapping a tub location for a vanity

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  1. #1
    DIY Member Anthony Curtas's Avatar
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    Default Remodel Q: swapping a tub location for a vanity

    Hi all,
    Doing some layout work on a remodel for later this year. One of the options we like has the double vanity moving where our existing tub is.

    Second floor, and I'd rather not pull the ceiling down on the ground floor if I can avoid it. Attic above and we're pulling the bathroom down to the studs, so in wall rough in should be no problem.

    Since the tub drain is in the floor and not the wall, is there any way I can use it for both sinks while avoiding an S trap configuration? The tub vent is in the back wall and could easily be extended to cover two sinks separately or together, but the actual drain is in the floor with a joist preventing me from easily moving it to the wall as well.

    I keep looking through books and internet and get a lot pictures of S traps and of all the plumbing in the wall.

    Here's a crude picture of what I had in mind.
    Name:  vanityvent.jpg
Views: 214
Size:  20.5 KB

    Thanks for any advice,
    Anthony

  2. #2
    Moderator & Master Plumber hj's Avatar
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    What do you mean by the "vent is in the back wall"? In some cases, depending on its size, it can be used for the sink drains and forget about the tub drain under the floor. I am not sure what your drawings are showing, of it they even show a "legal" installation.
    Licensed residential and commercial plumber

  3. #3
    DIY Member Anthony Curtas's Avatar
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    Quote Originally Posted by hj View Post
    What do you mean by the "vent is in the back wall"? In some cases, depending on its size, it can be used for the sink drains and forget about the tub drain under the floor. I am not sure what your drawings are showing, of it they even show a "legal" installation.
    Basically I was trying to draw the picture above, but in the cabinet. The difference being that I'd have to turn the top of the double fixture fitting into the wall with some 45's to tie into the vent.

    I hadn't thought about running drain out of the bottom of the wall to tie into the old tub drain.
    Last edited by Anthony Curtas; 03-14-2013 at 10:05 AM. Reason: Proper nomenclature

  4. #4
    Moderator & Master Plumber hj's Avatar
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    There is more than one way to do it, assuming EITHER the drain or vent is 2". You cannot do it with a 1 1/2" pipe.
    Licensed residential and commercial plumber

  5. #5
    DIY Member Anthony Curtas's Avatar
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    Hmm, the other tub in my house is 1-1/2", so this one likely is too. It is that I can't have two fixtures drain into a 1-1/2"? But one tub is fine?

    I have easy access to the attic, so I can vent it anyway I want.

    Thanks for the help.

  6. #6
    Consultant cwhyu2's Avatar
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    Waste arms can be 1 and 1/2 inch, a lav is 1 fixture unit 2 lavs on an inch and 1/2 drain is ok IPC.

  7. #7
    DIY Member Anthony Curtas's Avatar
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    Hmm, came across this picture here while looking into the double wye / cross fittings.

    Looks like this was exactly what I was thinking with all the fittings in the wall (so more under-counter space). Would limit me to a vanity with a closed toe kick, but I could deal with that.

    Name:  double_lav_rough_2.jpg
Views: 352
Size:  67.7 KB

    Is this still kosher? I know plumbing codes change and some methods are easier to clean / troubleshoot than others.

    Thanks.

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