I am thinking of replacing my upstairs toilet tanks with commercial-style flush valves. Normally the supply pipe to the valve goes into the wall and then upwards through the wall. In my situation it will be far easier to have the supply pipe simply go straight up into the ceiling, instead of having it go into the wall first. Is there any problem with piping it this way?
I can't find anything in the IBC that prohibits exposed supply pipes in bathrooms. The only relevant sections I could locate were:
310.2 Location of fixtures and piping. Piping, fixtures or equipment shall not be located in such a manner as to interfere with the normal operation of windows, doors or other means of egress openings.
405.6 Plumbing in mental health centers. In mental health centers, pipes or traps shall not be exposed, and fixtures shall be bolted through walls.
Of course, your local code may be more or less stringent.