Toilet /shower DMV

Discussion in 'Plumbing Code Questions' started by RMirenzi, Nov 16, 2012.

  1. RMirenzi

    RMirenzi New Member

    Messages:
    1
    Location:
    Seattle
    Toilet /Shower DWV

    My bathroom has a two foot 3" drain into the main 4" stack, this drains the toilet, the toilet is the highest fixture and vents into the main stack.
    I am adding a shower,
    I can vent the shower with a 1/1/2" existing vent about 3 feet from the toilet and within 1' of the shower trap.

    Can I insert a 3-2-3 Y fitting between the the toilet and stack to serve as the shower drain or do I need to tap into the main stack after it goes vertical. This tap in will lie between the toilet and the stack, essentially before the toilet stack vent pipe.

    Seattle codes.

    Thank You
    Bob
    Last edited: Nov 16, 2012
  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,776
    Location:
    Bothell, Washington
    If you put a wye in the toilet trap arm, you will also need a 2" wye between the 3x2 wye and the p-trap. The 2" vent would then tie back into the 4" vent stack at 42" above the floor.

    This essentially wet vents the toilet using the shower vent and prevents the toilet from siphoning the shower when flushed.

    Seattle code
    Last edited: Nov 17, 2012
Similar Threads: Toilet /shower
Forum Title Date
Plumbing Code Questions How to vent 1st Flr Toilet? Which Toilet Waste Run is the Best Option? Jun 24, 2014
Plumbing Code Questions Distance From Rim Of Toilet To Obstruction - Does That Include The Arc Of The Door? Jan 21, 2014
Plumbing Code Questions Dwv lines - toilet and bathroom sink Jan 28, 2011

Share This Page