drain/waste vent question

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by tlt3900, Jan 28, 2013.

  1. tlt3900

    tlt3900 New Member

    Apr 23, 2012
    Cypress Texas

    Thanks in advance for the help. I'm wanting to add a new lavatory to my bathroom upstairs. I hope i can explain my situation well enough in words.

    The existing toilet drain is about 4 feet from it's 3 inch waste vent. The new lavatory I want to add is about 6-8 inches away from the vertical section of the 3 inch waste vent for the toilet. Is it okay just to add a sanitary Tee into the waste vent and add my new lavatory drain there? Will creating this wet vent be an issue?

    Or, is it a better idea to run a separate vent line off of the new lavatory and then tie into the waste vent higher and run a separate drain for the lavatory and tie in with a Wye connector near the toilet drain.
  2. patma

    patma New Member

    Jan 21, 2013
    I just spent a ton of time researching toilet venting. Seems there is just as much support for a vent as there is for no vent. (A real hotly debated issue) I elected to wet vent the drain via a lav wye 7 feet from the flange. The toilet plumbing I removed for this remodel had no vent at all and the 3" drain line ran 11 feet. I worked fine for many years. I did not know it but toilets are considered self venting but codes require them on systems to protect other trap seals. (I'm an a DIY'er so take my comments w/ caution.. ;) Good luck. Great site here for info...
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  4. cacher_chick

    cacher_chick Test, Don't Guess!

    Jan 5, 2008
    Test, Don't Guess!
    Land of Cheese
    There is no issue with your lav drain being connected. The lav will still need it's own vent.
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