drain/waste vent question

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

  1. tlt3900

    tlt3900 New Member

    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

    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...
  3. cacher_chick

    cacher_chick 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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