Is this S trap or P trap?

Discussion in 'Plumbing Code Questions' started by leonk, Mar 23, 2014.

  1. leonk

    leonk New Member

    Messages:
    10
    Location:
    Ontario
    Just noticed this at my brothers home. Was wondering if this is an S trap or works fine? And if it's not legal, what are some suggestions to fix this?

    I'm thinking that everything is fine except for the sanitary T. The plumbing from the kitchen should go in to the T from the right (rather than top) and let the vent stack connect into the top of the T and into roof line.

    Except for main stack (3") everything else is 1.5". Horizontal distance from P to stack is about 5-6 feet total.

    Am I right, or does this work, or are there other problems here?

    P.s. the reason why the vent line is not in a straight line with main plumbing stack is because main stack is a few feet away from wall in basement (it has a 90 on top and goes across the roof to a different bathroom) while air vent to roof line seems to come up inside the outside wall. (hence the jot over)

    [​IMG]
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,889
    Location:
    New England
    S-trap...the trap arm cannot turn down until it is vented (it should slope 1/4" per foot, though).
  3. leonk

    leonk New Member

    Messages:
    10
    Location:
    Ontario
    How will you convert this to P trap? Where does the vent need to go? First 90 and nowhere else allowed?
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,889
    Location:
    New England
    After the trap, it must continue horizontally to the vertical vent. Without seeing the actual plumbing pieces, it's not easy to tell. It can be 1.5" up the vent, but should be 2" all the way to the drain, but you could use a 1.5x2x2 fitting to make the connection, or use a reducer on a 2x2x2 one.
Similar Threads: trap trap
Forum Title Date
Plumbing Code Questions Bathroom sink drain slope / trap questions Aug 14, 2013

Share This Page