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Thread: Single to double vanity - better way? Illinois

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  1. #1
    DIY Junior Member john-ee's Avatar
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    Default Single to double vanity - better way? Illinois

    Hi,

    Thanks for the great forum and advice. I'm looking to move some supply lines to transition from a single to a double vanity. The picture below is self-explanatory about what I'm thinking and I'd appreciate some experienced input to validate my plan. The drain used to be in the center of the existing supplies and I've already reconfigured it for the dual sinks with the added vent line. There is a 28" run from the left 1-1/2" drain to the center vent so I think I'm OK in that regard. I saw Terry's double vanity example picture with the black PVC drains and started down that route but I hit a snag when I realized that I didn't have quite enough space for everything to fit comfortably when overlapping the 1/2" supplies. There's only enough room for one supply in front and one supply behind the PVC. I then wanted to just move the tees below and create two new lines off of the 3/4" below, but the finished ceiling, the duct work, and the beam make that harder than I'd like. Does what I propose look unprofessional and if so, could you help me with something that works better?

    Thanks,
    -John-

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  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    No plumbing inspector would pass that setup.

    Normally a plumber would use a double fixture fitting on a double lav, this way both lavs would be vented.

    Last edited by Terry; 01-03-2010 at 08:57 PM.

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    DIY Member wallskev's Avatar
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    Thumbs down Becasue is not a resaon why !

    Terry:
    Would it be better to give a short reason why, other then a statement such as "No plumbing inspector would pass that setup."..

    This person nees to know "WHY" and if possible, like he stated " .....and if so, could you help me with something that works better ..."
    Kevin

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    Moderator & Master Plumber hj's Avatar
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    Default dwv

    "No inspector would approve that setup", period. The only sink "vented" is the left one. The left sink flows past the right one negating the effect of the vent on that trap. As far as the water piping is concerned, your drawing will work, although it seems to be much more complex than necessary.

  5. #5
    Plumber Cass's Avatar
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    You weren't thinking about it you did it...it's all cut and glued up....we don't know what state and or city you live in so we would have no idea what would pass and what wouldn't....

  6. #6
    Moderator & Master Plumber hj's Avatar
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    Default code

    Pass/fail depends on the code, and some of them are very lenient when it comes to hydraulic issues.

  7. #7
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    Default

    Besides the vent issue, how many fixtures are on those 1/2" lines?

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