I bought a new shower/tub surround that specs the alcove to be 60-1/8"
between rough-in walls. Based on that, the center of the toilet drain
(fixed into the concrete floor) to the rough wall would be 10-3/8",
assuming a straight 90-degree wall. I plan to use 1/2" greenwall
reducing this new distance to 9-7/8". I havn't purchased a toilet
yet but I'm concerned there may not be enough space. Would it be
better to purchase a toilet before installing the wall? When I
looked at other installed toilets each had various sized gaps (1/8" to
1-1/4") between the tank and the wall. My other options might be
1. Using thinner greenboard or panels for walls
2. Slightly angle the wall to make a toilet-to-wall custom fit
3. Put a small jog in the wall
What makes this so confusing is all the different toilet dimensions.
"Rough-in" dimensions for toilets can be 10", 12" or 14". With 12"
I find the term rough-in a little confusing since it's actually the
dimension from the toilet discharge centerline to the back of the
imo nothing rough there, better have a least that much room from
waste line centerline to finished wall (drywall or tile surface).
But you're in luck there is a "fitting" called an offset closet flange
that can be used to bump the waste line centerline,
I think you can get 1.5" or 2" offset but using one will require some
concrete demo. :(
Otherwise you could fool around with making the wall between the tub &
the toilet "thinner".
I assumed that the toilet backed up against the wall between the
toliet area & the tub?
I recently (well, not that recently) went through the headache of
having a rough in dimension too small.
They didn't account for the wall mud & tile when the bathroom was
built in 1930. I struggled with getting a 1930 wall tank (cracked)
out & replaced with "no room" to spare. I should have dismounted the
toilet, chipped away some tile & mud and installed an offset to make
my life easier. .....next time.
I went to New Orleans a couple of years ago when my church was
sponsoring the rehab of a flooded church building. The church had 18"
brick and stone walls.
Once upon a time, someone decided they needed a bathroom, and for some
reason the rough-in for the plumbing was too close to the wall. Instead
of going under the *wooden* floor and moving the plumbing, they
chiseled a four-inch "grotto" into the exterior wall so the toilet
I wish I had a picture....
I guess you're confused. ;)
Here's one toilet available in both round and elongated bowls and the
spec sheets showing the same rough-in and distance from the wall
Maybe you should call the manufacturers and tell them their spec
sheets are wrong. I'm sure they'd love to hear from you.
Unless you are a plumber, I would guess that I have installed at least as
many in this lifetime as you have.
I stand by what I posted. I also have one of each in my own personal home
and they are the same distance from the wall.
The standard for both elongated and round is 12". Colby and Rico are
I have installed between 35 and 50 toilets in my life, including 7-8
elongated bowl, 4-5 10" rough round front toilets, and three 14" rough
round front toilets. I haven't seen any elongated toilets other than
12" rough, but I wouldn't doubt that they exist.
I slightly prefer the elongated toilet to match the other toilets in
the home. I didn't realize that bowl type was connected to distance
to the wall. I'm willing to go with either type with a strong
preference to a good fit.
It's not. The rough-in dimension is a nominal dimension and there is
Here's one Toto 10" rough toilet:
It shows a more-or-less standard 3/4" clearance from the toilet to the
wall. If you're not tiling the wall behind the toilet you should be
Speaking of Toto toilets, I had recently renovated my in-laws
bathroom, and I had roughed in a standard 12" toilet drain. We had
ordered a Toto ADA compliant elongated 12" 2 piece toilet, and to my
surprise after we installed it there is still a good 1 1/2" of space
between the tank and wall. And I confirmed that this is a standard
bowl for 12" rough in. Why this happened, I don't know, but just a
suggestion, do some field measurements of the toilet bowl at the
showroom. Some manufacturers might do things differently.
I'm beginning to think that a spec of 12" to the wall may or may not
include a 1.5" space between the tank and wall. I'm guess that allows
for tiling, wanes coating, paneling, etc. Not what I intended, but
it looks like I'm going to buy the toilet BEFORE putting up the wall.
Wise choice. The spec sheet will always indicate the clearance to the
wall as well as the rough in dimension. There's always room back
I think that Toto understates the clearance from the tank to the
wall. The 3/4" indicated on their cut sheets in actuality is a _very_
heavy 3/4". 1" plus is more like it.
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