Wet vents

Discussion in 'UPC Plumbing Code Questions' started by orf, Sep 27, 2019.

  1. orf

    orf New Member

    Joined:
    Aug 12, 2019
    Location:
    Bradenton
    I'm about to embark on a bathroom remodel in a 10 x 10-foot room and will need to install a new DWV system. Currently, the only vent in the bath is a 1 1/2" that extends through the roof, I think that is the vent for the sink. The main vent is through the side of the basement wall about 25 feet away. The 4" waste pipe runs directly under the room and is in the middle of it about 5 feet from each outside wall The shower, sink, toilet, and bathtub drain into this pipe. I will be running a new 10' long pipe and drain into each side of it.

    My question is if I use 2 "or 3" drain pipe from each trap can I get away without venting each trap individually? Also, I'm assuming that I will need to vent through the roof so where would I install the vent in the 4" line? Would this be at the beginning of the line before anything drains into it or can it be done anywhere along the line? Thanks for the advice.
     
  2. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    You will probably HAVE to vent some traps. It all depends on HOW you configure the piping, as does the size and location of the central vent. Just putting a riser "somewhere along the line" and calling it a vent does NOT work.
     
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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Generally, you want each trap vented. There are exceptions for those where you can wet vent a bathroom group. One of the issues is the size of the pipes and the distances to the vent, so as was said, it is possible to wet vent a bathroom group, but how it is done is critical for it to function properly.
     

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