Uniform Plumbing Code and Stack Termination

Discussion in 'UPC Plumbing Code Questions' started by IPDQKWID, Nov 24, 2017.


    IPDQKWID New Member

    Jul 14, 2016
    906.2 Clearance Each vent shall terminate not less than 10 feet from, or not less than 3 feet above, an openable window, door, opening, air intake, or vent shaft ...

    None of these things occur on a normal house roof. The main items protruding from a single-family residence roof are usually exhaust, so I am wondering if I am mistaken in interpreting a roof-mounted attic vent as an opening?
    Thank you.

    I found this website, which tries to explain plumbing code while explaining what terms mean.
  2. Colepepper Plumbing

    Colepepper Plumbing New Member

    Mar 17, 2018
    San Diego, CA
    If there is a second story to the house, this is what they are referring to. Say kitchen sink is first floor and there is a roof over hang, then the second story there is a window
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    Air conditioners with a make up air feature, or an evaporative cooler would be "air inlet" devices.
  5. cacher_chick

    cacher_chick Test, Don't Guess!

    Jan 5, 2008
    Test, Don't Guess!
    Land of Cheese
    Many houses also have dormers with windows, which would also be where the code section would be applied.
  6. Reach4

    Reach4 Well-Known Member

    Sep 25, 2013
    If you search for the term "operable skylight", you will see there are skylights that can open.
  7. Cool Blue Harley

    Cool Blue Harley One Dumb Plumber

    Apr 16, 2016
    San Francisco, CA
    This code section is really just about allowing for the diffusion of sewer gas and preventing it from entering the building.

    Three feet above a window, or ten feet away, three feet from the property line, one foot above the top of an operable skylight in the open position and seven feet above a roof deck used for assembly purposes.

    It usually comes into play during remodels where forethought is required and proper points of termination are overlooked; rear additions, shed roofs, roof decks, skylights.

    In commercial work, it's usually make-up air or air intakes as HJ mentioned.

    Edit: Oh, and in San Francisco where they have combination storm/ sanitary systems, rain water downspouts for roof drainage can be a problem.
    Last edited: Mar 27, 2018
    Terry likes this.
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