Quick kitchen sink vent question

Discussion in 'Plumbing Code Questions' started by PM5K, Apr 29, 2014.

  1. PM5K

    PM5K New Member

    Messages:
    154
    Location:
    San Antonio, TX
    The current sink drain runs horizontally approximately 36 inches sloped through base cabinets, then tees off into a vertical drain, with a vertical vent on the other end of the tee.

    There are some guys working on a relatives kitchen and they want to run the drain straight down below the
    house and then run it the same way towards the same vent and drain.

    Basically they are taking what was happening right below the sink and doing it under the house. I'm not sure which code we have here but does that meet either major code?
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,156
    Location:
    Bothell, Washington
    You can't use a sink drain for a vent on the floor below.

    If you add a fixture below, you will need to vent it before it enters the waste line.
  3. PM5K

    PM5K New Member

    Messages:
    154
    Location:
    San Antonio, TX
    Sorry if I wasn't clear, there is no floor below, it's a pier and
    beam foundation home. Would this be a proper wet vent, against code, or something else?
  4. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,250
    Location:
    Land of Cheese
    A vent has to go up before or at the point which the drain turns down. A 1-1/2" trap arm can be up to 3-1/2 feet to the vent if necessary.
  5. PM5K

    PM5K New Member

    Messages:
    154
    Location:
    San Antonio, TX
    It sounds like you're saying no, since the drain would go down before it hits the trap arm, before that hits the stack/vent.
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