How to determine rough-in

Discussion in 'Toilet Forum discussions' started by jechow, Jun 8, 2008.

  1. jechow

    jechow Member

    Jan 5, 2008
    British Columbia

    I currently have a Crane toilet. I noticed on the bottom of the toilet bowl exterior that there are 2 bolts holding down the toilet. If I measure from the wall to these 2 bolts, I am assuming that this distance is my rough-in. Is this true?


    Yes, it's measured from the "wall" to the center of the drain, or in most cases, the bolts that hold down the bowl to the floor.
    (Not to the floor mold)
    Last edited by a moderator: Jun 8, 2008
  2. Redwood

    Redwood Master Plumber

    Dec 15, 2007
    Service Plumber
    The rough in is the measurement from the finished wall (not base board) to the center of the flange...

    Measuring from wall to the bolts should be a close enough measurement.
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    If the bolts are fastened in the proper locations, then they will be centered on the drain pipe and give the rough in dimension. That flange, the way it is secured, would allow the bolts to be positioned off center of the drain, and could thus allow for a mismeasurement AND potential problems.
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