Max drop out the bottom of a toilet.

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by lahabra, Dec 22, 2007.

  1. lahabra

    lahabra New Member

    Messages:
    50
    Location:
    California
    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. Terry

    Terry Administrator Staff Member

    Messages:
    14,889
    Location:
    Bothell, Washington
    With UPC plumbing code, it's six feet developed length from the flange to the vent.
  3. lahabra

    lahabra New Member

    Messages:
    50
    Location:
    California
    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?
  4. Terry

    Terry Administrator Staff Member

    Messages:
    14,889
    Location:
    Bothell, Washington
    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. lahabra

    lahabra New Member

    Messages:
    50
    Location:
    California
    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. GrumpyPlumber

    GrumpyPlumber Licensed Grump

    Messages:
    1,404
    Location:
    Licensed Grump
    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.
  7. Winslow

    Winslow Plumber

    Messages:
    450
    Location:
    Hawaii
    24" according to the UPC
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