PLEASE HELP! Does anyone make a 15 1/2” rough in toilet?

Discussion in 'Toilet Forum discussions' started by MsBee, May 2, 2021 at 1:24 PM.

  1. MsBee

    MsBee New Member

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    The toilet bowl in our very old crane toilet cracked. We live in an almost 100 year home and the toilet is in a very small powder room. So we are looking for something that is comfort height and small. Does anyone make a 15 1/2” rough in? What can I do.
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    Retired Systems engineer for defense industry.
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    No, nobody makes a 15.5" rough-in toilet! But, many of the older toilets actually have four bolts holding them down, so those that are 15.5" from the wall, may not be those attaching the toilet to the flange.

    BUt, if it is really 15.5", unless you can move the flange, your best bet would be a 14" RI toilet.
     
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  4. Reach4

    Reach4 Well-Known Member

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    I used a 12 inch Unifit for a rough a little over 13 inches. Doing something similar with a 14 inch Toto Unifit is probably your best action.
    What I did:
    Initially, using the bolt method, I thought I had a 13-7/16 rough.
    http://www.terrylove.com/forums/ind...baseboard-and-shoe-molding.58080/#post-428138

    http://www.terrylove.com/forums/ind...nifit-or-stick-with-the-12.59681/#post-442544
    showed what I did... my rough was closer to 13 inches.
    It turned out that my rough was less than I initially thought based on external bolt measurements. The bolts were not in long slots which would have provided some easy adjustability; they were in side slots. The bolts were not the exact same distance to the wall.

    https://terrylove.com/forums/index.php?threads/toilet-rough-in-dilemma.89675/#post-643625
    has marked-up unifit photo showing the concept. The drywall screws (green arrows) would not have been necessary. I do overkill at times.
     
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  5. WorthFlorida

    WorthFlorida The wife is still training me.

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    Most toilets do have 14" bowls avaialble. 12" is standard and many will list 10" or 14" offsets. There are offset flanges adapters that are made for such a problem. As Reach mentioned, the Toto Unifit is a good option. https://www.homedepot.com/p/JONES-S...our-Way-Offset-Closet-Flange-C44420/313740730

    Many toilets do not fit up against the wall and I have one bathroom with one about 1"+ from the wall. With a 100 year old home cast iron was or still is in use and it was not always easy to get the flange exactly where you wanted it. Also the location of floor joists may had to do with it. The home may have been built when high wall tanks models were the norm and the trap way and a little bowl for little there was, was in front of part of the base. The water actually flushed toward you, the front of the bowl. I do not know what the flange locations were for those antiquites. My grandparents house in Brooklyn, NY had one.
     
    Last edited: May 2, 2021 at 8:11 PM
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    You are not going to find a new, code compliant toilet with more than a 14" RI...they do not exist as new. The best you are likely to come up with is a 14" RI toilet that you cheat as much as you can when attaching the bolts while keeping the outlet pointing down into the toilet flange without obstructions and then live with the extra space behind the toilet.

    The advantage of a TOTO that uses their proprietary UniFit adapter is that a 10, 12, or 14" Unifit, on a 10, 12, or 14" RI flange position are exactly the same toilet, and will stick out into the room the same exact amount. Most others sold as 10 or 14" use the same bowl, but then make different depth tanks to fit the space behind , meaning, the toilet could stick out much further from the wall than one that can use the UniFit adapter and no, it doesn't work on just any toilet...the toilet must be designed for it.
     
  7. Tuttles Revenge

    Tuttles Revenge In the Trades

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    Dang.. doesn't look like the Geberit Monolith is an option in the US anymore.

    A heavily modified Duravit rear discharge with floor adapter might work..

    Nah.. too weird and hard to work with..

    Go with the TOTO 14" rough and the modification that Reach4 shows..
     
  8. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    You could make a floor to maybe 30" or so fake wall behind the toilet, and the top could be a shelf to hold whatever...that would minimize the space behind the toilet. Other than aesthetics, the extra space behind the toilet isn't a functional problem...it might be because it sticks into the room more than you want, and often, in a bathroom, extra space is worth it.

    If you opt to modify the Unifit adapter, you could gain a little bit, but there's a limit on how far you can shift the toilet and still have the adapter fit under the toilet...you can only move the front back so much before it will hit the inside front of the toilet.
     
  9. Reach4

    Reach4 Well-Known Member

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    You don't move the Unifit with respect to the toilet.
     
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  10. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    The TOILET moves relative to the unifit...the 10" RI will move the toilet 2" further out from the wall than the 12" RI and the 14" one will move the toilet back towards the wall.

    If you extend the length of the Unifit, the front, relative to the part that fits over the flange will move towards the front of the toilet. The toilet in the front tapers and the shape of each varies some depending on model, so there's a limit on how far back you can move the end that the toilet fits down onto. SS-00458_MS614114CEF_G.pdf (totousa.com) I haven't looked under one in awhile (I have two that use the Unifit), but as the Unifit gets 'longer', it will move further towards the front of the toilet...don't know how far you can go.

    Print (totousa.com) shows that the 14" Unifit is 2" longer (moving towards the front) versus the 12" one, so if you wanted the same 3/4" nominal space behind the toilet, and had 15.5", and modified the Unifit, it would now move another 1.5" further towards the front of the toilet. It probably will fit, but you'd have to check carefully.
     
    Last edited: May 6, 2021 at 8:30 PM
  11. Reach4

    Reach4 Well-Known Member

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    Really?
     
  12. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    Retired Systems engineer for defense industry.
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    If the back of the toilet stays 3/4" from the wall, where is the front of the Unifit? On a 10" rough, it will sit further from the front of the toilet, than it does if the longer Unifit is fitting for a 14" RI. Sorry, if you can't see this, there may not be any hope. There's a limit on how far forward you can extend the Unifit's length while keeping the design distance from the wall...the toilet is only so long, and it does taper towards the front, eventually, you'd be setting the toilet down on the front part of the Unifit rather than the floor.

    I have not looked at the bottom of the toilet for years, mine went in in the early 2000's, so don't have a good feel for how much room there is on the bottom that is open enough to allow the Unifit to be modified to make it longer so it can fit on a longer non-standard RI. It might fit fine...my point was to carefully measure before you start modifying things!
     
  13. Reach4

    Reach4 Well-Known Member

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    You were proposing to lengthen the 14-inch Unifit? I doubt that would be successful.
     
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