I recently roughed in a toilet at 12" from the finished wall. I had assumed that this would leave some room behind it. The toilet was tight to the wall. Does this mean that a 12" rough-in does not include 1-2" of space typically found behind a toilet? The only other possiblity that I can think of is that the toilet I recieved was a 14" rough-in. I have a second bathroom roughed-in but I have not purchased the toilet yet. I need to know if I should order a 10" if I want a little space behind it.