It depends on the model you are looking at.
For the TOTO Ultramax II I need 11.5"
For the CST744S TOTO Drake I need 10-7/8"
Check the spec sheet on the toilet you're looking at for the listed space between the tank and the wall. There are many that work with 3/4" of space behind the tank.
Standard 12" rough, I've seen from 10-7/8" to 11.5" being needed.
10" rough from 9-1/4"
14" rough from 13-1/4"
How can I determine whether there is a gap and if so, how much of one? In other words that a 12" toilet would actually be able to fit in an 11.5" space?
We started remodeling our very old home (1945) and removed the 12" toilet from the bathroom. The walls had to come down and be replaced. The result was that the original walls were 1/8" thick but now with sheet rock, they are 5/8" thick and we have only 11.5" space. The toilet we purchased does not fit in the 11.5" space.
I know what kind of toilet I want but what I can't figure out from looking online is whether there is a 1/2" gap remaining. Even with the example above, the Toto UltraMax II, the spec sheet shows a gap, but does not say how much of a gap.
Can you offer advice so I know to select the correct toilet?
Thank you.