10" rough-in requires special flange?

[Mr Blint]

In our powder-room, we have a 1950s-era American Standard two-piece toilet and an untiled wall behind it, which we want to tile. But the rear edge of the toilet's tank lid actually touches the wall behind it. It's a 12" rough-in.

I thought it would be possible to find a toilet with a 10" rough-in and mount it on the existing flange, in order to create more space behind the toilet, for the extra thickness of the tile.

But then I saw an article on another site warning that 10" rough-ins require special flanges. I don't understand.
Could someone please explain?

P.S. It is a tiny powder-room and the front-end of the toilet now comes to the edge of the door opening, and the waste pipe is cast-iron.

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[Reach4]

No. There may be some such toilet, but normally they just need a regular flange.

There is probably a better way to get some more space. Some 12 inch rough in toilets give more space.

 

[Sponsor]

 

[Terry]

A 50's era toilet uses most of the 12"
Modern 12" toilets may get by with anywhere between 10-7/8" and 11-1/2"
I would pick up a new 12" and check to spec sheet to see if it fits. I would not use a 10"
Most manufacturers have an optional 10" bowl.
TOTO also has some models that convert from 10", 12" and 14"
They also have a 10" bowl in their lineup, as does American Standard.
But for you, go with the current crop of 12's.

 

[Jadnashua]

Measure from the toilet flange mounting bolts to the wall behind (not the baseboard - the wall). THat is what you need to compare the spec sheet to see how well it will fit.