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?

  • The main problem I see is that potential buyers, when the time comes, may be put off by it. Other than that .. up in an upstairs bathroom? i guess it depends how water's being distributed in your place, but I'm a trifle surprised. – keshlam Aug 27 '15 at 0:28
  • @keshlam The water reservoir is in the attic. It has to be above the toilet to provide a gravity flush. – Tyler Durden Aug 27 '15 at 1:19
  • Oh, I see. Like the old British system minus the pull-chain. I presume that where you live attics never freeze. – keshlam Aug 27 '15 at 1:22
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    "all commercial flushing systems use gravity feed systems" is an utterly untrue statement. Using the word "feed" would lead most to think of water supply. Is gravity part of how flushing works? Yes. Are all system supplies ("feed") gravity fed? No. – Jimmy Fix-it Aug 27 '15 at 5:42
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    @TylerDurden - there are certainly many (most?) commercial flush valves that use water pressure rather than a gravity feed, if you're looking for information about a particular type of flush valve, it is customary to put that information into the question. I've never come across any above-ceiling reservoirs in any commercial building I've worked in. – Johnny Aug 27 '15 at 5:56

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.

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    Hmm, I guess you could consider my house a mental health center. I guess I need to have the pipe in the wall. – Tyler Durden Aug 27 '15 at 0:27
  • I think that it "should" be in the wall for general cosmetic/resale reasons, but I think if it was done in what my wife calls "Warehouse Chic" way, it could look really cool. Great question. – BrownRedHawk Aug 27 '15 at 12:11

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