Do I need a separate vent?

Discussion in 'IPC Plumbing Code Questions' started by wiz02, Apr 17, 2021.

  1. wiz02

    wiz02 New Member

    Joined:
    Oct 9, 2015
    Location:
    Philadelphia, PA
    Hi:

    I am changing my 2nd story tub from a LH to RH drain, so you don't have climb in between the toilet and the tub to turn on the shower. Originally all the plumbing was along one wall with lav, toilet and tub in a row. When I opened the walls, I was expecting to see vent stacks for all 3 fixtures, as shown below, but there is only the one behind the toilet. The distance from the tub drain to the stack is 3 feet in the current configuration. Tub drain is 1 1/2" PVC. If I move the tub drain to a RH configuration (adding 5 ft.), am I out of spec? And more importantly, any concerns about doing it even if it meets code? I can get a vent up to the attic without too much trouble if need be.

    BTW, I was expecting to see venting as shown in the diagram but the only vent is behind the toilet. I have the walls open behind the lav and the tub and no vents are present. Out of curiosity, does the as built configuration meet code requirements? Thanks in advance


    Expected Venting With Text.png in the
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    I am confident that London code would differ from the various US codes.

    But applying general principles, the lavatory should have a trap and vent before the drainage goes down.

    WC and tub might meet at least some US codes without extra vents.
     
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  4. wiz02

    wiz02 New Member

    Joined:
    Oct 9, 2015
    Location:
    Philadelphia, PA
    Thanks for the quick response Reach4, I never thought too much about the Union Jack avatar, until I saw your reply and realized that the default location for the forum is London. I quickly moved across "the pond" to get accurate answers. The lav has a trap, just no vent, same for the tub.
     
  5. wwhitney

    wwhitney Well-Known Member

    Joined:
    Mar 17, 2019
    Location:
    Berkeley, CA
  6. wiz02

    wiz02 New Member

    Joined:
    Oct 9, 2015
    Location:
    Philadelphia, PA
    Wayne, you are the man ! Great citation and Thanks!
     
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