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Thread: basement bath

  1. #1
    Join Date
    Sep 2009
    Township of Washington, NJ

    Default basement bath

    I'm looking to install a full bath in my basement. I will need to "t" into the existing stack which is 4". My question is would a 3" line be large enough for the main waste line out of the basement bath. It will only be aprox. 9 feet to the stack.

  2. #2
    Join Date
    Aug 2007
    The Great White North

    Default Re: basement bath

    I'm guessing you're running the drain for this bathroom under the concrete slab.
    Chances are the existing main drain line is 4 inch in which case most codes require a 4 inch line tied into the main line usually a wye is used and not a 90 "T". under the floor.

    Check with your local building department when you apply for the permit ---- they will tell you what's required for your local codes.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  3. #3
    Join Date
    Feb 2008

    Default Re: basement bath

    Yes, always use a "Y" instead of a "T". Be sure you put the "Y" WITH the flow of the waste in the drain line.

    Good luck,

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