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Vents Thru The Roof

Discussion in 'Commercial Plumbing Codes' started by north star, May 3, 2018.

  1. north star

    north star Sawhorse

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    * = * = *

    I am seeking input from the Forum on Vents thru the Roof ( VTR's ).

    On some military plans that I have been reviewing recently, it has been

    discussed [ by some ] to NOT have any penetrations in any of the roofing
    systems.........This idea is intended to extend the life of the roofing
    systems.


    Do any of you adopt this approach ?

    Thanks for your input !

    * = * = *
     
  2. ICE

    ICE Sawhorse

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    We do not limit roof penetrations. I have worked a few military projects....I’m imagining ten pages on how to not penetrate the roof.
     
    north star likes this.
  3. mtlogcabin

    mtlogcabin Sawhorse

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    903.5 Location of vent terminal.
    An open vent terminal from a drainage system shall not be located directly beneath any door, openable window, or other air intake opening of the building or of an adjacent building, and any such vent terminal shall not be within 10 feet (3048 mm) horizontally of such an opening unless it is 3 feet (914 mm) or more above the top of such opening.

    903.6 Extension through the wall.
    Vent terminals extending through the wall shall terminate at a point not less than 10 feet (3048 mm) from a lot line and not less than 10 feet (3048 mm) above average ground level. Vent terminals shall not terminate under the overhang of a structure with soffit vents. Side wall vent terminals shall be protected to prevent birds or rodents from entering or blocking the vent opening.
     
    Pcinspector1 and north star like this.
  4. north star

    north star Sawhorse

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    $ = $

    Thanks **ICE** & **mtlogcabin** for your input !

    $ = $
     
  5. steveray

    steveray Sawhorse

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    VTW.....Like MT said if you don't want the hole in the roof...
     
  6. Pcinspector1

    Pcinspector1 Platinum Member

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    Government building, "Is it hot air their venting?":rolleyes:
     
  7. Paul Sweet

    Paul Sweet Sawhorse

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    When designing a building I try to combine vents in the attic to the greatest extent practical and minimize the number of roof penetrations, both for appearance and to reduce the number of potential leak points.
     
  8. mp25

    mp25 Active Member

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    I wonder if AAV would be an option under the code that you are working with - although it would be one more thing for the building engineer to worry about.
     
  9. north star

    north star Sawhorse

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    mp25,

    Thanks for your input !


    I would not choose to use AAV's for venting.....I consider them
    to be mechanical devices with moving parts, that at some
    point in the future, WILL stop working !......That could possibly
    cause a detrimental effect on removal of the sanitary sewer
    gases in the lines.......Plus, diagnosing a failed AAV somewhere

    in the installed vents would be problematic [ IMO ].

    It is my intent to change the mindsets of Leadership and some
    RDP's, by removing all roof penetrations in the design and
    actual installation of the plumbing systems........It CAN be done.

    It just needs a different and compliant way to do it.

    # = # = #
     
  10. conarb

    conarb Sawhorse

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    North Star:

    In the late 50s I took a magazine published by the NAHB, it was a nice glossy magazine that isn't published anymore. I remember an article published in about 1959 about a test house built in a tract of homes in I believe Arizona. The test house had all the vents combined in the attic into one ½" copper pipe that ran horizontally emerging through the eves, at the time the test house had performed with no problems for a couple of years, if I remember correctly the system was fought by the plumbers' unions because it would reduce work for plumbers.
     
  11. ADAguy

    ADAguy Sawhorse

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    Hmm, chimneys still look good on buildings even if not used as originally intended.
     

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