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

    Apr 21, 2010, 04:32 PM
    Sink over sink vent
    In Mass. Is it OK to have one 2" stack with kitchen sinks on the first and second floor tied in, with no separate venting? Or does the first floor sink need a vent pipe that attaches to the stack above the sink level on the second floor?
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #2

    Apr 21, 2010, 04:59 PM

    Let's ask a Mass plumber. Mark?
    You around?
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #3

    Apr 21, 2010, 05:24 PM
    Hi all:

    I'm sorry to say that in Mass. and anywhere else I know of, you need to have an individual vent for that 1st floor sink and it must connect at a minimum of 6 inches above the flood level rim of the kitchen sink on the 2nd floor.

    One option that could help is an automatic air vent... or AAV. An AAV is a mechanical vent that eliminates the need to run that 1st floor vent, but unfortunately, it is ABSOLUTELY ILLEGAL in Massachusetts, so I don't recommend it, but I wanted you to know about these in case you hear about them from others is all.

    Any questions, let us know...

    Mark
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