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Thread: Vent termination: above roof -vs- out the wall

  1. #1

    Default Vent termination: above roof -vs- out the wall

    We're working on a house with cathedral ceilings and a metal roof that we do not want to penetrate with vents. California Plumbing Code applies which is based on the UPC. We would prefer air admittance valves (AAV) for secondary fixtures, but they are not allowed. Contrary to our inspector's statement (an ex-plumber for 30+ years), we believe the vent does not need to go "through" the roof, but can go out the wall, see diagram.

    Here is the code, CPC sect. 906.1, Each vent pipe or stack shall extend through its flashing and shall terminate vertically not less than six (6) inches above the roof nor less than one (1) foot from any vertical surface.

    And CPC sect. 906.2, Each vent shall terminate not less than ten (10) feet from, or at least three (3) feet above, any openable window, door, opening, air intake, or vent shaft, nor less than three (3) feet in every direction from any lot line, alley and street excepted.

    Since the is no specific requirement to go "through" the roof, all 3 of the vent solutions meet the literal requirements of the CPC. Are we correct, or we the first ones to challenge the ingrained conventional wisdom?

    Thanks for any constructive comments, --MC

  2. #2
    Master Plumber nhmaster's Avatar
    Join Date
    Jul 2008
    S. Maine


    Nope, you can go out through the side if you keep the clearances proper. No problem.

  3. #3
    Extreme DIY Homeowner Scuba_Dave's Avatar
    Join Date
    Jan 2009
    South of Boston, MA


    Just wondering, Is that diagram from the code book?
    DIY Handyman (not 4 hire)
    I have enough to do to my own house


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