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Thread: Help with my basement toilet rough in situation!

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  1. #1
    Audio Engineer eds1275's Avatar
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    Default Help with my basement toilet rough in situation!

    I have an issue with my basement toilet rough-in. As in the toilet pipe was loose - in fact, it came right out with the slightest tug. It was ABS going down to CI. How do I connect a new toilet pipe? I have roughly 4 5/8" to work with - but I'd like to install an offset flange to allow for a standard 12" rough in from the wall. It was originally 10 1/2.

    I built a raised sub floor which gives me room for the offset flange but I am still undecided on how to connect the ABS to the CI. The CI is down in the concrete. I'll go take some pics and post back in a few.

  2. #2
    Audio Engineer eds1275's Avatar
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    Here's some photos of my predicament!
    Last edited by eds1275; 06-20-2011 at 01:03 PM.

  3. #3
    Expert Plumber plumber2011's Avatar
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    Hi Eds,

    You have a few options:

    1) install a manhoff fitting and pour a lead joint (not very homeowner friendly here).

    2) install a compression donut of the appropriate size, soap up the gasket and push the ABS into place (more like drive the ABS pipe in using a piece of wood and a hammer)...see image of the compression donut. The ABS pipe edge should be slightly beveled at the end to push in and seat properly.

    3) Use soil seal...see image. Some people install an oakum material under the soil seal. I can't say what I would do as I always lead in a manhoff and go that way most of the time.

    The 2nd option is probably most homeowner friendly...gasket and plumber's soap available at any plumbing supply house!

    Questions? Let us know, OK?
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  4. #4
    Audio Engineer eds1275's Avatar
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    Thank you good sir!

    As it turns out, my original evaluation was all wrong! I went to clean out the hole with a wire brush and discovered that the hub of the CI actually goes right up to be level with the concrete - it was pretty rough looking so I thought the pipe ended under the concrete. After a nice buffing with a wire wheel it is clear that the pipe is indeed up where it should be.

    Annoyingly, I tried desperately to find a donut but every single plumbing store I went to gave me a blank stare. Using brand names and even pictures. I didn't find a single place that carried them.

    I think I'll be trying to pack the joint and use the soil-seal.

  5. #5
    In the Trades Gary Swart's Avatar
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    I know you're trying to save a few dollars, but this is one connection you don't want to come loose in the future. I would suggest you bite the bullet and hire a plumber to lead a flange to the CI at the proper height. The other methods may work fine, but you never know. Of course it's easy for me to spend your money, LOL.

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
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    If you use the donut, ensure the pipe is seated properly, and the CI is clean, then anchor the flange to the concrete with the appropriate fasteners, it will be solid. But, if the CI is as rusted as it looks, you may not be able to clean it up enough to get the donut to seal properly. Hard to say without being there. There's normally no pressure there, so the risk is only if and when there's a backup (clog).
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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