Why toilet flange resting on top of finished floor

Discussion in 'Toilet Forum discussions' started by raymes, May 22, 2008.

  1. raymes

    raymes New Member

    May 22, 2008
    I have read many inputs advising that a toilet flange should rest on top of the finished floor (if at all possible). Can someone advise why this is?
    Is it to ensure a certain amount (height) of the flange is inside the base of the toilet so that ideally only one wax ring is required?

  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    It puts the flood plane on top of the floor rather than embedded in it, and provides a shorter bolt length that makes it more stable, and keeps the wax thickness at a more ideal thickness.
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  4. Gary Swart

    Gary Swart In the Trades

    Sep 1, 2004
    Yakima WA
    Or, put another way, that's the way toilets are designed.
  5. Redwood

    Redwood Master Plumber

    Dec 15, 2007
    Service Plumber
    As it stands the wax ring is the weakest joint in the waste system. Anything less than right increases chances of leakage! Leakage can ruin wood!

    Need I say more?
  6. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    To answer your question, YES. Toilets have varying spaces under them where they attach to the flange. By putting the flange on top of the floor you are assured that even those with a maximum space will still seal with the standard wax ring. IF the flange were not on top of the floor and the conventional wax ring is used, there is a possibility that it would not even come in contact with some toilet's base and thus give no seal at all.
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