We recently did some remodeling, and in the process, managed to hook up the toilet in the bathroom to the hot-water line. The trouble is, we discovered this fact after we had already put down the plywood, cement board, and then floor-leveling compound (The floor is very sturdy, let me tell you!)
What's the easiest way to tear down back to the studs? The initial floor removal was messy and lots of saw-zalling, but since we were going to replace it anyway it wasn't a big deal.
UPDATE WITH BETTER SCHEMATICY PHRASING AND A MAP.
It's a second floor bathroom. All the water lines run through the floor of the room. They actually run in a U, from the corner where the lines come up next to the main drain, along the outer wall, then to the sink where they T-off. From there, it goes to the end of tub/shower wall, where they then go up into the wall where the tub faucet/valve is. Then from there, up into the wall to the showerhead.
The ceiling on the floor below is the ancient lathe/plaster (Although it might just be lathe) with a covering of tin tiles/sheets/sheets that look like tiles.
SECOND UPDATE WITH SOLUTION
After some convincing, we've opened up the toilet-side of the shower wall (It's one whole piece), and put a T-fitting into the shower's cold line. The new line pokes out the side and into the toilet as opposed to from the floor, but at last it's cold water, haha. Thanks for all the help guys and gals and those of an unspecified gender!
Best Answer
Open shower wall.
Cut hot line in wall and cap it.
Cut cold line in wall.
Put a T on cold line.
Connect cold line to shower.
Connect cold line to toilet.
Repair wall.
Sit on toilet and notice the bad repair job you did on wall.