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Thread: toilet drain vertical minimum

  1. #1

    Default toilet drain vertical minimum

    What is the minimum vertical height between the bottom of where the bend starts in the horizontal drain pipe and the flange? Assume the drain pipe is 4" interior dimension and flange is 1/4". The center of the drain pipe is only about 18 inches from vent stack so not a lot of slope to it.

    _ (flange sitting on floor)
    min. vertical? l
    ________ (horizontal pipe line)


  2. #2
    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
    Join Date
    Nov 2005
    Central Florida


    It wouldn't be too hard to lay a closet bend against a flange in any of the big box stores to get a rough idea. I'd guess something like 6-7".

  3. #3

    Default yes, but...

    I guess what I mean is: is it acceptable from a plumbing perspective to have such a short distance for the water etc. to flow from the toilet, into the drain before it hits the bend? If the flange measures 2 inches, roughly, top to bottom, plus the 4 inches until the bottom of the pipe, that's not much of a drop before it hits the bend. Does that matter?

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default height

    The minimum distance is as little as you can cut it and still get the flange to slide over with a good seal. Which usually means the riser has to be as long as the flange is deep.


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