water flows uphill?

Discussion in 'Drain Cleaning' started by jleonardwv, May 11, 2014.

  1. jleonardwv

    jleonardwv New Member

    Messages:
    2
    Location:
    West Virginia
    Building my own home. Did the plumbing myself. Built the shower with liner and tested to make sure no leaks before putting deck mud in the liner.

    No leaks, everything fine. Then...

    As I drained the approx. 2" of water from the shower liner, I got a leak from an as-yet-unfinished bath tub drain. Very weird because the water would have to run against gravity to exit the tub drain line. Here's the setup:

    --1.5" tub drain---------\
    .................................|
    .................................|
    .................................|
    .................................|------------2 inch shower drain----------------vent----trap------shower
    .................................|
    .................................|
    .................................|
    2" vent and sink trap----|
    .................................|
    .................................|
    .................................|
    .................................|
    ...........................to sewer

    (I notice in the discussion board, all the spaces are removed, so I added periods so you see the layout correctly. Ignore the periods.)

    I was careful to allow 1/4" slope (or slightly more) per foot of run, so the water would have to run a couple of feet uphill to get out of the tub drain. In addition, I used all long sweep Ts and elbows in the horizontal runs. Any ideas what might have caused the water to backup out of the tub drain? The only thing I can think of is something caught in the line down from the T where the 2 inch shower drain meets the tub drain line. Since it's a brand new house, I was very careful not to let anything get in the lines...

    Jamie
    Last edited: May 11, 2014

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