Vent pipe termination distance over roof?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Scuba_Dave, May 12, 2009.

  1. Scuba_Dave

    Scuba_Dave Extreme DIY Homeowner

    Messages:
    885
    Location:
    South of Boston, MA
    This is what I found on a search
    So 6" above the point where it exits the roof is OK?
    I also want to box this in to "hide" it somewhat as it will be viewable from the front

  2. kingsotall

    kingsotall Plunger/TurdPuncher

    What are we venting¿
    Furnace¿
    DWV¿
    Water heater¿
    Boiler¿
  3. Scuba_Dave

    Scuba_Dave Extreme DIY Homeowner

    Messages:
    885
    Location:
    South of Boston, MA
    That would help
    It's the existing vent stack for plumbing
    There is one on each side of the house
    Other side has 2 bathrooms- 2sinks/showers/toilets
    This side has kitchen sink

    Addition has been added on this side of the house
    So the stack needs to go up higher then the new roof

    Interesting that the old location was very close to a bedroom window that opened & gable vent
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,825
    Location:
    Cave Creek, Arizona
    vent

    What is REQUIRED and what is INSTALLED do not always agree.
  5. SewerRatz

    SewerRatz Illinois Licensed Plumber

    Messages:
    1,705
    Location:
    Chicago, IL
    This is from the Illinois plumbing code. I hope some of the items in it are helpful.

    Section 890.1430 Vent Terminals
    a) Roof Extensions. Extensions of vent pipes through a roof shall be terminated at least 12 inches above such roof unless a roof is to be used for any purpose other than weather protection. If a roof is to be used for any purpose other than weather protection, the vent shall be extended at least seven (7) feet above the roof. (See Appendix K: Illustration D.)

    b) Flashings. Each vent terminal shall be made water-tight with the roof by proper flashing.

    c) Location of Vent Terminal. No vent terminal from a drainage system shall be directly beneath a door, window, overhang or other ventilating intake opening of the building, nor shall any such vent terminals be within 12 feet horizontally of such an opening unless it is at least two (2) feet above the top of such opening. (See Appendix K: Illustration E.)

    d) Extensions Outside Building. No soil, waste or vent pipe extension (except for vent terminals as provided in (a) and (c) above) shall be located on the outside of a wall of any building, but shall be installed inside the building. Vents located within an exterior wall or in a wall adjacent to an unheated space shall be protected from freezing.

    e) Flag poles. Vent terminals shall not be used for the purpose of supporting flag poles, television aerials, or similar purposes. ​

    Attached Files:

  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,139
    Location:
    New England
    Note you need to take into account the pitch of the roof, as shown in one of the diagrams, to determine the height above. This would normally mean it must be more than indicated at the point of penetration unless it was a flat roof.

    You'd have to talk to the inspector about boxing it in as that would create other problems, and might mean it would still have to exit even higher. You want it above the anticipated maximum snow depth on the roof, too, so that may help dictate the height.
    Last edited: May 13, 2009
  7. Scuba_Dave

    Scuba_Dave Extreme DIY Homeowner

    Messages:
    885
    Location:
    South of Boston, MA
    Thanks
    6" just didn't seem high enough
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