No Apparent P-Trap under Tub/Shower Drain

Discussion in 'Shower & Bathtub Forum & Blog' started by Tony Strungis, Nov 19, 2019.

  1. Tony Strungis

    Tony Strungis New Member

    Joined:
    Nov 19, 2019
    Location:
    Green Valley, AZ
    The photos I enclosed is of my house under construction 10 years ago. I am removing the tub and putting in a shower. After removing the tub, I see no p-trap at the drain location (1st photo). Is it possible that the p-trap is under the concrete floor before it ties into the 4" drain before the vent? Should I put in a p-trap at the shower drain? I don't know what to do. Thanks all.
     

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  2. hj

    hj Master Plumber

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    It is normally ALWAYS under the floor the same depth as the connection to the sewer system.
     
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  4. Tony Strungis

    Tony Strungis New Member

    Joined:
    Nov 19, 2019
    Location:
    Green Valley, AZ
    So, if you were me, you would go ahead and install the shower with a 1.5" to 2" drain? Don't worry about the P-Trap? Thanks
     
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    I'd probably break up the concrete and see the depth of the existing p-trap if you can't determine that without. FWIW, while you can get a shower pan with an offset drain, most people much prefer the optics of having it centered. If you're going to leave it at the end, a linear drain (expensive) is a nice upgrade. If you do break up the concrete, you could upgrade that line to a 2" one (it may be under the slab). The bigger potential gotcha is if the p-trap isn't deep enough to allow the slope required to move the p-trap. While some places seem to allow a shower without a liner, or to not have the liner sloped to the drain, don't get caught in that situation. There are lots of ways to build a reliable tiled shower, but while not difficult, it is very detail oriented. Mess up one aspect, and it can fail. Much cheaper to do it right the first time. Read Tiling 101 in the tutorial section for a short intro.

    If you're going to do tiling, check out www.johnbridge.com for help with that.
     
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