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Thread: Connecting bathtub drain to main vent stack.

  1. #1
    Join Date
    Apr 2010
    Location
    Toronto
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    139

    Default Connecting bathtub drain to main vent stack.

    I'm getting some conflicting advice about the best way to join a tub drain to the main stack.

    The book Remodel Plumbing (Rex Cauldwell) warns against using anything but a sanitary T-fitting when joining a sink to a vertical drain/vent because having a fitting with too much sweep will cause a siphoning effect. I'm wondering if the same principle applies when joining a 1-1/2" tub drain to a 4" vent stack (the P-trap is about 5 feet from the stack)


    I'm joining a bathtub drain to a main stack and can't make the connection anywhere near level to the P-trap. I need a drop of about 10". Going by the book, I'm thinking that this configuration would work:
    photo 1.jpg

    ...but I've also been told that this setup with a Y and short 45 would work perfectly fine:
    photo 2.jpg

    Any informed opinions?
    Last edited by bonobothegreat; 10-10-2013 at 11:37 PM.

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  3. #2
    Join Date
    Feb 2006
    Location
    Ottawa
    Posts
    3,308

    Default Re: Connecting bathtub drain to main vent stack.

    There's nothing wrong with stack venting, but if you're pushing the 5' limit I would add the separate vent as the first picture shows.
    Paul

  4. #3
    Join Date
    Jan 2010
    Location
    Tilbury, Ontario
    Posts
    115

    Default Re: Connecting bathtub drain to main vent stack.

    Paul's advice is good if you're getting close to the 5" limit. Alternatively, since you're using a 4x2 wye, you could switch to 2" trap and pipe from the tub creating additional wet-venting and do it as in the second diagram.

    Mark.

  5. #4
    Join Date
    Apr 2010
    Location
    Toronto
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    139

    Default Re: Connecting bathtub drain to main vent stack.

    Thanks Mark and Paul. I appreciate the help.

    I've got the 1-1/2 pipe and fittings on hand so if the top drawing is fine, I'll go with that.

    Paul

  6. #5
    Join Date
    Feb 2006
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    UH, Winnipeg!!!
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    Real Name
    Michael

    Default Re: Connecting bathtub drain to main vent stack.

    They also make a fitting that has the 3" for the toilet as well as a 1 1/2" for the tub, that is what I used in my house, I believe it is called a closet fitting.
    The Bitterness of Poor Quality Lingers Long after the Cheap Price is Forgotten!!!!!

  7. #6
    Join Date
    Apr 2010
    Location
    Toronto
    Posts
    139

    Default Re: Connecting bathtub drain to main vent stack.

    ...just followup question to this; would it be ok to join a wet vent from the vanity sink to the horizontal section of the tub drain with a wye fitting (laying on it's side)?

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