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Thread: HELP! What to do with cast iron(?) shower drain

  1. #1
    DIY Junior Member timmyers15's Avatar
    Join Date
    Jul 2006

    Default HELP! What to do with cast iron(?) shower drain

    Hi. I'm currently in the middle of tiled shower remodel (shower was built in 1920's). Below is pic of shower drain right now. My question: can the top two pieces (I believe they are called clamping ring and drain barrel?) be removed so the original drain base can still be used with the new shower pan. Spoke with one plumber that wants to cut out all around the drain in the cement subfloor (this is 2nd floor bathroom with no underneath access, BTW) and replace the trap and part of the drain line running into it. This scares me because I'm afraid it will require a long run of the old (presumably) cast iron drain line to also be replaced, and lots of demo in places I don't want demo'ed

    Any thoughts, ideas, or advice would be greatly appreciated.


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  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona


    Once you remove the concrete from the drain, there should be three or four bolts holding the clamping ring.
    Licensed residential and commercial plumber

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    Was that an old lead liner? Not sure you'll get that apart. You need to chip out some more of the old mudbed to expose the drain line and trap. What you see, may not be in good shape, or it could be fine. You don't want to build a new shower on top of it and then discover that the trap and drain line are not in very good shape.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    Join Date
    Jan 2010
    Blog Entries


    Go with the plumber who wants to install the new p-trap and shower drain. If you use a pvc shower liner,make sure you pre-slope the foor before the pvc pan is installed. make sure a water test is done to insure the pan does not leak.

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