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Thread: Kitchen and bath sink to 3" waste line

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    Default Kitchen and bath sink to 3" waste line

    Scenario: 3" drain that will connect to 1st floor toilet. kitchen and bathroon sink upstream from the 3" waste line. No disposal, dishwasher to be installed. Kitchen and bath 1 1/2" drains are vented at each location.

    Best connection is:

    A. Connect kitchen and bath with 1 1/2" 'Y' then run single 1 1/2" line to 3" drain connecting in a 3 X 3 X 1 1/2 T after toilet 90 deg. Toilet waste would then be in the 3" line before sink drain connection to the 3" sewer line.


    B. Extend 3" waste line beyond the toilet, connecting the toilet with a T, then connect the 1 1/2" bath and kitchen sink lines to the 3" sewer line.

    Runs: From kitchen to Kit/bath 1 1/2" T connection would be 6 1/2'.
    From bath sink to Kit/Bath 1 1/2" T would be 5 1/2'
    Kit/Bath 1 1/2" T to 3" Y connectionis less than 2'
    Toilet waste flange to vertical waste sewer is 3 1/2'

    All runs will have 1/4" per ft slope.

    Thanks you all for your time monitoring these forums and your excellent advise.

    Thank you,
    VT David

    formerly of NH

    Diagrammed PIC

    Last edited by VT David; 01-07-2007 at 11:07 AM.


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