I need to replace a leaking toilet, but the distance from the drain to the wall is about 10.75". The selection of toilets that I'm finding in the 10" rough-in range is pretty pathetic and overpriced, especially water-conserving ones.
Ideally I'd like to relocate the drain 2" so I have a standard 12" rough-in. The problem is that my house is on a 4" slab-on-grade (with just bare dirt right under it), and the plumbing–all original cast iron– is thoroughly entombed in the concrete. The bathroom floor is ceramic tile right over the concrete slab.
What's the best way to go about doing this without causing too much damage or destroying enough of the bathroom tile that the damage will be visible even after placing the new toilet? Or is that a given? I have a rotary hammer, a sawzall with diamond abrasive blades, a circular saw with a masonry blade, and lots of other such tools.
Or is this a patently ridiculous idea and I should just get a 10" rough-in toilet?
Best Answer
Plumbing in concrete slabs pretty much requires ripping the floor open to make any changes to it. I suppose if you chose a new toilet with a LARGE base and were very careful you MIGHT be able to keep all the floor damage under it, but that's making assumptions that you'll be able to rework cast iron pipes (not the most cooperative things) through a fairly small hole.
I'd suggest that the extra cost of a 10" would have to be quite high before it made sense to rework for a 12" - or else you should consider if you'd like to change the tile as well, so ripping up the floor is not a problem.
Edit: I suppose the other question I didn't think to ask is where the current toilet is leaking? I rebuilt a 40 year old one last spring, as it was starting to leak around the tank bolts. Replaced the rubber washers, replaced the tank to bowl seal since I had to take the tank off to replace the washers, and was out of there with a non-leaking (for, presumably, the next 30-50 years) toilet for under $10. Left the bowl in place during the overhaul, so no new wax ring, as that end fortunately was not leaking. Unless you crack the china, they generally can be overhauled to like new, or better than new condition.