DWV Layout Basement Bathroom - layout review

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by great white, Feb 13, 2012.

  1. great white

    great white New Member

    Dec 16, 2009
    We are in the planning stages of adding bathroom to basement. This new bathroom is directly below existing upstairs bathroom. House is 1 story ranch. Looking for additional opinions. Most of the plumbing contractors are saying, AAV vent for vanity and no other vents required do to close proximity to existing stack. I am also concerned about the toilet drain connecting upstream of shower and vanity. Is there a risk with flow of toilet siphoning out the traps for shower and vanity?

  2. cacher_chick

    cacher_chick Test, Don't Guess!

    Jan 5, 2008
    Test, Don't Guess!
    Land of Cheese
    The existing stack has no effect on the proposed addition.

    If that is what they are telling you they are apparently are not versed in proper plumbing or the plumbing code.

    Michigan uses the International Plumbing Code (IPC)
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  4. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    You can not use the upstairs waste stack for the downstairs bath as any sort of vent. It's the waste stack for the upstairs.
    Wet venting is only for a bathroom group on the "same" floor. That means you can using wet venting "within" the bathroom group (altogether on one floor)

    Your layout does not vent the shower,
    The lav would vent by the AAV
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