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Thread: Basement Toilet installation

  1. #1
    In the Trades
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    Oct 2007
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    Gastonia, NC
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    Question Basement Toilet installation

    Hi All,
    I have a 3 in drain in the floor, basement is above the septic tank. I'm getting ready to build a platform to install the toilet unless someone can tell me there's a flange that can go inside a 3 in drain? I haven't been able to find one so far.

    Thanks!

  2. #2
    In the Trades Gary Swart's Avatar
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    Sep 2004
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    Yakima WA
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    A flange inside of a 3" pipe would restrict the size of the drain too much, and I don't think there is one anyway. A toilet on a platform is the mark of a hack job and I would advise avoiding that. Chip concrete around the pipe to expose enough to accommodate a 3" flange, clean it off so the flange will fit over it. You probably will want to rent a rotary hammer/drill to do this and work carefully so as not to break the pipe. It will take some time and effort, but it will be the best way.

  3. #3
    Homeowner geniescience's Avatar
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    Nov 2005
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    3" drain, with or without a P trap? Has this drain already been used as a floor drain?

    You have to know whether the pipe is made for a toilet with or a P trap in it.

    you are best off chipping out the floor around the pipe.

    david

  4. #4
    In the Trades Gary Swart's Avatar
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    As I re-read your original post, I understand what Geniescience is concerned with. If the drain you want to use was a floor drain or a shower, then it has a P trap under the concrete and will have to be removed. A toilet has it's own trap built in and you can't have 2 traps.

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