Venting for Half Bath

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  • #647822

    I dont do this stuff on my jobs, but this is for my house so Im going to try to tackle it myself. Mostly out of my element here.

    Anyway, going to add a half bath off the kitchen directly above. Ive got a nice drain stack already. Toilet will practically be directly above. You can see in the pic the drain entering from the washer. Upper pipe is a 1 1/2″ vent that heads 20′ feet or so to the main stack.

    Plan is to put a vent loop in the wall and come back down. Is this existing vent adequate to tie into? If so, what’s the proper configuration?




    elmwood park, NJ

    Ryan is the picture correct or need rotating? Im not grasping it

    We always tie second floor toilet waste below first floor so the second floor flush doesnt siphon out of the trap of the first floor. Sooooooo becareful how you merge your waste

    Working Pro since 1993

    Tom M


    Yeah, sorry, picture was sideways. Corrected below.

    So the toilet line from above needs to be below where the 2″ washer drain line comes into the stack, correct?

    Any ideas on the vent lines?

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