Can you use the main stack to vent? P

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Afterworkguinness, Apr 11, 2020.

  1. Afterworkguinness

    Afterworkguinness New Member

    Joined:
    Apr 11, 2020
    Location:
    Ontario, Canada
    I've seen diagrams where venting for a fixture is only provided by the main stack which is close to said fixture. Is this generally allowed and if so, what are the requirements to do this it correctly?
     
  2. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    The distance is somewhat immaterial other than it is limited by the same factors that limit ANY waste arm. The main stack CANNOT be used as a vent if there are ANY water using fixtures connected above it, (and it cannot be used as a drain/waste if it is venting any lower fixtures).

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