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Thread: Plumbing problem with bathtub/shower

  1. #1

    Default Plumbing problem with bathtub/shower

    I have a split level home, with 2 bathrooms, one right above the other one.

    The shower/tub plumbing on the upstairs one leaks water from somewhere, into the downstairs bathroom.

    when I removed the ceiling tile to see if I could see what was going on... there's a large PVC pipe (maybe 7" across) with another smaller pipe that leads into it.

    It appears the leak is somewhere in the smaller pipe... but it's a really compact space, and I need to get a ladder & flashlight down there to get a better look.

    I realize this is a dumb question... but what do I do next?

    How big is a drain pipe that goes out of a bathtub?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    A tub drain is usually 1.5" in diameter. A toilet 3-4" (these are inside diameters, the outside diameter will depend on the type of pipe). Water can flow along the pipe for a ways before it drips, so it can sometimes be tricky determining exactly where it is coming from. The tub drain can connect to the toilet drain before it goes down.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Member FJK's Avatar
    Join Date
    Jun 2005


    Isolate the componets in the upstairs bathroom by operating them 1 at a time. Obviously, this is only while troubleshooting, because you need to leave the bath room functional. So, this may take a few days, on & off to track down the source of the problem. I'd start with the bath tub. First, note how much water you see on the pipes & attempt to wipe dry. Then start running water in the tub with the drain open. See if the pipes start getting wet. Then, repeat with toilet, sink, etc. I might note that if you think the source is your tub , repeat the test by filling your tub & not letting it drain. I had this problem & it was a poor seal at the drain fitting in the tub.


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