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Thread: Toilet Flange Install

  1. #1
    DIY Junior Member slippy field's Avatar
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    Default Toilet Flange Install

    I've been told it should be 12.5" on center from the stud. I'm a little worried about it being too short (tank hitting the wall) or possibly too long, tank too far from the way. But if it was an inch away from the wall and not 1/3" that wouldn't be the end of the world. I've seen these offset flanges and was wondering can you buy different lengths of offset or are they like a standard length? 2"?



    1-1/2" offset
    Last edited by Terry; 11-30-2013 at 11:33 AM.

  2. #2
    In the Trades Gary Swart's Avatar
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    That is the proper distance from the wall. Not sure why you say, "on center from the stud" though, We usually state the rough in as 12" from the finished wall. Many folks are a bit confused by rough in measurements. A toilet rated as a 12" rough in, actually needs less than that. (Never more than) This allows for a bit of space behind the toilet as well as a flange that is set an inch or so less than 12". While we are at it, the flange is supposed to set on top of the finished floor...not recessed below.

  3. #3
    DIY Senior Member wjcandee's Avatar
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    There are a few toilets that take the whole 12", but those are relatively-rare. Most Totos have about 3/4" behind them when installed on exactly 12", but not all.

    Gary is correct that you measure the rough-in from the finished wall (i.e. once you have painted, wallpapered, tiled, whatever, but not including any base molding) it should be 12" to the centerline of the flange from the finished wall.

    And Gary is correct that you want to mount the flange on top of the finished floor (i.e. once you have laid down all the tile or whatnot). The base of the flange will rest on top of the floor and be secured through the finished floor to the underfloor.

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
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    Depending on the brand and model of toilet, it will have a varying amount of space behind it when mounted on a correct, standard rough-in. THe most common rough-in in the USA is 12" from the FINISHED wall. Your 12-1/2" assumes it has 1/2" drywall on it (baseboards don't count unless they are excessively tall). That may or may not be the case - for instance, should you decide you want to tile the wall or put up wainscoating, 12-1/2" from the stud may NOT be enough.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #5
    DIY Junior Member slippy field's Avatar
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    I meant 12.5" from the framed wall. I'm not 100% sure what my finished floor on top of the cement slab will be. I've just seen things that say have the flange flush with the cement slab and I've read others that say leave it 1/2" up above the cement to slide your finished floor under.

  6. #6
    DIY Senior Member wjcandee's Avatar
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    Whatever you have read, here is the actual answer: (1) The centerline of the flange shall be 12" from the finished surface of the adjacent wall; (2) The flange shall be mounted on top of the finished floor and secured to the subfloor.

    Simple. Easy peasy.

    Accomplishing this involves interplay between the various trades. The tile guy wants to have the flange mounted on the subfloor so that the plumber can leave and he can tile around it. That is, however, not going to give you the flange mounted as it should be.

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