We are about to replace 2 older toilets with Toto Ultramax units. The units to be replaced are the original American Standard units installed in 1971. My question relates to 'Rough In' size. The specs on the Toto unit states "12inch" roughin dimension (wall to center of drain). I see other models in your listing show "Options" for 10inch or 14inch rough in distances. Is there any reason to be concerned that this dimension is different for my installation? Was the 12inch dimension standard in 1971 compared to today?
Toilet 'Rough In' Dimension?
- Thread starter Beaux
- Start date
We are about to replace 2 older toilets with Toto Ultramax units. The units to be replaced are the original American Standard units installed in 1971. My question relates to 'Rough In' size. The specs on the Toto unit states "12inch" roughin dimension (wall to center of drain). I see other models in your listing show "Options" for 10inch or 14inch rough in distances. Is there any reason to be concerned that this dimension is different for my installation? Was the 12inch dimension standard in 1971 compared to today?
Redwood
Master Plumber
Standard rough in dimensions are 10, 12, and 14" rough in.
I would measure from the finished wall surface (not the baseboard) to the rear set of bolts holding the toilet down.
I would measure from the finished wall surface (not the baseboard) to the rear set of bolts holding the toilet down.
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hj
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toilet
12" has always been the "standard". If yours is 14" then a 12" will fit. If it is 10" then you need a 10" to replace it.
12" has always been the "standard". If yours is 14" then a 12" will fit. If it is 10" then you need a 10" to replace it.
Gary Swart
In the Trades
The confusing thing about this is that although toilets are classified a 10", 12", or 14" rough-in, in actual practice, this is not an exact science. First of all, very often the flange is not set at exactly any of those distances. Secondly, many times the actual space the toilet takes up is less than it's specification. In other words, a toilet classed as a 12" rough-in may only require 11 inches and so on. I don't recall every hearing of a toilet needing more space that it's classification. Sometimes homeowners have been able to install their toilets on less-than-standard rough-in sizes because of this. You just have to examine the spec sheets for the toilet you desire and see what space it actually uses.
