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  1. #1
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    Default Separation between garage and attic

    I was telling a client that having holes in the garage ceiling was a breach of the separation between the garage and attic. He asked why then does the mechanical closet require the combustion air ducts that are open to the attic. I thought about it and did not have a good answer.

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  2. #2
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    Default Re: Separation between garage and attic

    Quote Originally Posted by Frank Bombardiere View Post
    I was telling a client that having holes in the garage ceiling was a breach of the separation between the garage and attic. He asked why then does the mechanical closet require the combustion air ducts that are open to the attic. I thought about it and did not have a good answer.
    .
    It's in an enclosed closet separate from the garage.
    .

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
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  3. #3
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    Default Re: Separation between garage and attic

    True, but it is not sealed off from the garage. There is a door that can be left open and gaps around the door.

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  4. #4
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    Memphis TN.
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    Default Re: Separation between garage and attic

    Quote Originally Posted by Frank Bombardiere View Post
    True, but it is not sealed off from the garage. There is a door that can be left open and gaps around the door.
    .
    The door to the dwelling may be left open as well.
    .

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  5. #5
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    Mar 2007
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    Ormond Beach, Florida
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    Default Re: Separation between garage and attic

    If the door does not meet the requirements for the door between the house and the garage:
    - R309.1 Opening protection. Openings from a private garage directly into a room used for sleeping purposes shall not be permitted. Other openings between the garage and residence shall be equipped with solid wood doors not less than 13/8 inches (35 mm) in thickness, solid or honeycomb core steel doors not less than 13/8 inches (35 mm) thick, or 20-minute fire-rated doors.

    And that includes being weatherstripped and with a threshold as that door would be the same as the door to the house - it would be in the thermal envelop of the living space.

    If that door is not sealed and does not also meet the requirements for the door, then the 'garage' is considered to extend into the mechanical closet and the ceiling of the mechanical closet would be required, and any openings from the mechanical closet would not be allowed to terminate in the attic, those opening would be required to be extended out and through the roof, gable, etc.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  6. #6
    Join Date
    Mar 2007
    Location
    Oklahoma City
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    Default Re: Separation between garage and attic

    I guess they don't enforce that here, because all the mechanical closets have doors with no weather strips and they are also hollow core wooden doors with sometimes a 2 or 3 inch gap under them. Yet they have the combustion air ducts from the closet into the attic.

    If it weren't for lawyers, we would never need them.

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