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Thread: Two questions

  1. #1

    Default Two questions

    I am working on a project that stretches my skills a bit and I have a couple questions before I get busy on it.
    I just bought a house that has no rough-ins in the basement, but it has two copper Vent stacks that go from the basement floor to the roof. In the basement I want to rough in a bathroom that I am planning it out. My plan is to have a toilet, a sink and a bathtub/shower draining (through their P traps) into a 4" pipe that slopes down into the vent stack under a concrete floor. These are my questions:

    1) Would you use ABS for the main drain pipe into the vent stack? Or plastic? The vent stack is copper, and it seems a shame to cut out a piece of copper, attach the rubber sleeves on each side of plastic/ABS sanitary Tee. I could try to find a copper sanitary tee in that size, but then I would have to connect the ABS/Plastic to the copper. Any suggestions here would be helpful. Should I just try to do it all in copper and forget about those rubber sleeves, because they just done inspire confidence there under a concrete floor.

    2) An upstairs bathroom drains into this stack just under the joists in the basement. The new bathroom will have a main venting pipe connecting to the same stack. Is it enough that this venting pipe connects to the stack above any sanitary tee that drains into it, or do I have to go higher than that for some reason Im not understanding yet?

    Thanks in advance for your help.

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default drains

    It would be unusual for a copper stack to go into the concrete floor, much less run under it. You can make a transition to plastic using the proper transition couplings as needed. You cannot connect the vent to a functioning drainline, otherwise you would just provide a second drain path in case the original one plugs up.

  3. #3
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    San Diego


    1. ABS is plastic (black). The other type of plastic uses is PVC (white).

    Working with 3 and 4" copper is maybe not a DIY project.

    2. You keep mentioning vent stack. Do you mean drain stack? Tying into a drain and tying into a vent are 2 different things.


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