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Connecting bathtub drain to main vent stack.

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  • 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, 11:37 PM.

  • #2

    Re: Connecting bathtub drain to main vent stack.

    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

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    • #3

      Re: Connecting bathtub drain to main vent stack.

      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.

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      • #4

        Re: Connecting bathtub drain to main vent stack.

        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

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        • #5

          Re: Connecting bathtub drain to main vent stack.

          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!!!!!

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          • #6

            Re: Connecting bathtub drain to main vent stack.

            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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