toilet/shower vent help

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by vhms1, Dec 9, 2008.

  1. vhms1

    vhms1 New Member

    Messages:
    2
    We are cuurently doing a remidel and adding a shower. Right now the toilet is 6" from the 3" main drain and has a 3" vent pipe. I can Tee into the 3" line right under the toilet very easily then I want to run a 2" ABS line for the shower. Will the toilet vent be enough or do I still need to vent the shower as well? If so how to I add the vent in that line? Thank you.
  2. kingsotall

    kingsotall Plunger/TurdPuncher

    Last edited: Dec 10, 2008
  3. vhms1

    vhms1 New Member

    Messages:
    2
    i understand the drawing, but my main vent pipe has the toilet 6" away from it and the shower about 5' away from it. Can't I just use that vent for the shower as well? or do I need to separately vent the shower? how about using one of those inline vents if I need to vent it? Thank you.
  4. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    IPC will let you run 6' of 2" to a vent.
  5. NHJeremy

    NHJeremy New Member

    Messages:
    5
    If I understand your question, no you cannot vent the shower with the main stack. When you flush your toilet, water flowing down the drain will (in theory) create negative pressure, and suck your shower trap dry.
    You need to vent the shower drain separately.

    If you want to use an air admittance valve to do so, it must be accessible, at least under the IPC. It must be installed vertically, and must be installed 4-6" above the trap weir, depending on manufacturer.

    ABS is dead, use PVC.
  6. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    That depends on where you are located. In some areas it is seldom seen and in others it is the dominant plastic for DWV work.
  7. NHJeremy

    NHJeremy New Member

    Messages:
    5
    oh no kidding, yeah dont see much of it at all up here in NH
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