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-   -   Why can't a toilet be installed upstream from a sink (https://www.askmehelpdesk.com/showthread.php?t=513248)

  • Oct 3, 2010, 05:29 PM
    effinoff
    Why cant a toilet be installed upstream from a sink
    Why can't a toilet be installed upstream from a sink or shower?
  • Oct 3, 2010, 06:54 PM
    ballengerb1

    That only applies to a branch drain line. It's a venting issue and could cause the sink trap be siphoned clean out of its water trap.
  • Oct 4, 2010, 05:19 AM
    speedball1
    Quote:
    Originally Posted by effinoff View Post
    why can't a toilet be installed upstream from a sink or shower?
    It's strictly against code to discharge a major fixture, such as a toilet, past a unvented minor one, such as as sink. Bob gave you a great explanation.
    Quote:
    Because it could cause the sink trap be siphoned clean out of its water trap seal.
    Cheers, Tom

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