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    effinoff's Avatar
    effinoff Posts: 1, Reputation: 1
    New Member
     
    #1

    Oct 3, 2010, 05:29 PM
    Why cant a toilet be installed upstream from a sink
    Why can't a toilet be installed upstream from a sink or shower?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
     
    #2

    Oct 3, 2010, 06:54 PM

    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.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
     
    #3

    Oct 4, 2010, 05:19 AM
    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.
    Because it could cause the sink trap be siphoned clean out of its water trap seal.
    Cheers, Tom

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