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Thread: How flat should a toilet bottom be?

  1. #1
    DIY Senior Member Joerg's Avatar
    Join Date
    Oct 2004

    Default How flat should a toilet bottom be?

    Hello Folks,

    Got a Yorkville but it has to head back because of a wee curing crack in the water intake port. I called A/S and they said it's better to get a replacement. Ok, can happen. Anyway, since I wanted to get done with the wall I placed it for a "sanity check". This was quite a surprise.

    It's a back discharge commode and the rear bolts would not fit. I had them exactly six point zero inches on center as per spec. Only significant bending of the bolts would have made them go in. So, I measured and found that the holes in the toilet were less than 5-3/4" apart and also smaller than the usual 1/2" wide by 3/4" high. Same for the bottom bolts. Thank God I haven't drilled the tiles yet. The waste outlet was a bit high (I had leveled the floor tiles to exactly 4" as per spec). Also, the toilet rocked a lot, sideways and back. I took great care to have the tile floor perfectly flat, like usual in a bathroom.


    1. How much maximum wiggle should a toilet exhibit on a perfectly flat floor?

    2. Spec sheet distances for the screws: Do they mean anything these days?

    Quite frankly, for $280 plus tax (sans tank, of course, which is another $200) I had expected more. All the cheaper toilets I ever placed hardly needed any shims but that was a long time ago and not in the US.

    Regards, Joerg.

  2. #2
    Plumber Cass's Avatar
    Join Date
    Nov 2005


    A toilet should not move at all on a flat floor.

    The toilet bowl should match the specs. Talk to A/S about it and see what they have to say.


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