This is a stupid question but I forgot the answer. Is the toilet "rough-in"
measured from the wall to the hold down bolts or from the wall to the back
of the toilet base? I think it's the former but just want to make sure.
I think the uniform construction code or the plumbing code requires a
30" space for a toilet, between finished surfaces, which would put the
waste pipe 15" on center. Not sure how far to put the waste pipe in
front of the wall.
The most common rough-in distance is 12" from the "FINISHED" wall surface.
I made the mistake of measuring 12" from the bare studs.
This wasn't a problem in our main bath, as there was still adequate room
behind the toilet for the 1/2" sheetrock.
However, we used T&G pine boards in our master bath that were 3/4" thick.
The toilet still fit, but the tank lid sits right up against the wall.
Anything more than that (two layers of sheetrock for instance), and the
toilet may not have fit.
We lucked out, but if this is a new installation, be sure to factor in the
thickness of the finished wall surface when you are making your
All water closets do not have the same measurements, There are some with
deferent centers. The measurement is usually from the finish wall to center
of waste pipe ( that would be the same as hold down bolts) So check what
the spec's are for your Water closet.
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