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Thread: Max drop out the bottom of a toilet.

  1. #1
    DIY Member lahabra's Avatar
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    Smile Max drop out the bottom of a toilet.

    Is there a maximum vertical drop from a toilet flange to the 90* elbow?

    I am considering a design which would have an ~18 drop to an elbow, then a 7 x 4" horizontal arm then a vertical vent.

    I am planning a major bathroom re-configuration. I am trying to avoid a lot of cement cutting. I will have my work inspected.

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    With UPC plumbing code, it's six feet developed length from the flange to the vent.

  3. #3
    DIY Member lahabra's Avatar
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    I have an old book that says I can have a tolet 10' away from the vent if I use 4" pipe.

    Are you quoting a rule for 3" pipe? Or is my book out dated?

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    Forum Admin, Expert Plumber Terry's Avatar
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    3" and 4" for toilet.

    If you have things other than a toilet, then it's 10 feet for 4" and six for 3"
    But a toilet is always six feet whether it's 3" or 4"

  5. #5
    DIY Member lahabra's Avatar
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    Thanks for the clarification.

    So is there a limit to the length of the drop? or could I have a 5' drop into an elbow?
    ---------------------------------------------------------------------

    WC
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    . 5'
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    90*...v....................................street

  6. #6
    Licensed Grump GrumpyPlumber's Avatar
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    My code allows up to 20" drop without a seperate vent on WC's, a 4" line can run up to 8' without a vent.
    It all depends on your local code.
    My code says your ok.
    "The biggest regrets we have in life are the chances we never took."

  7. #7
    Plumber Winslow's Avatar
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    Quote Originally Posted by lahabra View Post
    Is there a maximum vertical drop from a toilet flange to the 90* elbow?

    I am considering a design which would have an ~18 drop to an elbow, then a 7 x 4" horizontal arm then a vertical vent.

    I am planning a major bathroom re-configuration. I am trying to avoid a lot of cement cutting. I will have my work inspected.
    24" according to the UPC

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