Can I use a sanitary tee in these locations?

Discussion in 'UPC Plumbing Code Questions' started by RJick, Oct 15, 2020.

  1. RJick

    RJick New Member

    Joined:
    Oct 12, 2020
    Location:
    Oregon
    [​IMG]Do I need a wye with a 45 or can I use a sanitary tee. I am trying to insert
    a pdf but don't know if it is going through. [​IMG]

    Thanks
     
  2. wwhitney

    wwhitney Well-Known Member

    Joined:
    Mar 17, 2019
    Location:
    Berkeley, CA
    No pictures.

    Sanitary tee is required when a horizontal trap arm turns into a vertical drain and a vertical vent take off.

    Sanitary tee is allowed when a horizontal drain meets a vertical drain.

    IPC may allow a sanitary tee on its back for a vent take off with the drain remaining horizontal; UPC requires a combo there, and I think a combo is better.

    Otherwise use a combo (edit: for drains).

    Cheers, Wayne
     
    Last edited: Oct 15, 2020
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  4. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Why is that? Santee for venting is more compact.

    If you have a cleanout in the vent pipe, I agree the combo makes it certain that the snake goes the right way.
     
  5. wwhitney

    wwhitney Well-Known Member

    Joined:
    Mar 17, 2019
    Location:
    Berkeley, CA
    Primarily because I learned under the UPC, but also because if you have the room, why not use the combo? But I would consider a san-tee on its back for a vent takeoff if I ever did a project under the IPC and I needed the compactness.

    Cheers, Wayne
     
    Last edited: Oct 15, 2020
  6. Tuttles Revenge

    Tuttles Revenge In the Trades

    Joined:
    Oct 15, 2014
    Why: is because under the flood level of the fixture the vent must act as a drain in case the whole plumbing system backs up with waste. In seattle / king co. we can get away with a san tee on its back. just like installing a med 90 as a trap arm stub out rather than a long turn.
     
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