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    New postby RICHARD TAN on Fri Apr 03, 2009 12:00 pm

    Hi Jerry,

    Duct penetration through the garage ceiling, required min. 26 gauge steel IRC 309.1.1.. Is rigid duct board acceptable material to penetrating the fire assembly?
    Posts: 60
    Joined: Wed Jan 14, 2009 9:43 am


    New postby Jerry Peck - Codeman on Fri Apr 03, 2009 2:02 pm

    Hi Richard,

    First, the Florida Building Code, Residential has a similar requirement as the IRC for using 26 gage metal for that duct, however, duct board rated Class 0 or Class 1 IS a suitable alternative - however, the duct board would need to be labeled with such rating, otherwise I would write it up because the use of duct board is 'only allowed if rated Class 0 or Class 1'.

    Third, that is not a "fire assembly", it is simply "separation".

    From the Florida Building Code, Residential, with 2006 Revisions. (underlining and bold are mine)
    - SECTION R309
    - - - 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.
    - - - R309.1.1 Duct penetration.
    - - - - Ducts in the garage and ducts penetrating the walls or ceilings separating the dwelling from the garage shall be constructed of a minimum No. 26 gage (0.48 mm) sheet steel, 1-inch (25 mm) minimum rigid nonmetallic Class 0 or Class 1 duct board, or other approved material and shall have no openings into the garage.
    - - - R309.2 Separation required.
    - - - - The garage shall be separated from the residence and its attic area by not less than ½-inch (12.7 mm) gypsum board applied to the garage side. Garages beneath habitable rooms shall be separated from all habitable rooms above by not less than 5/8-inch (15.9 mm) Type X gypsum board or equivalent. Where the separation is a floor-ceiling assembly, the structure supporting the separation shall also be protected by not less than ½-inch (12.7 mm) gypsum board or equivalent.
    Jerry Peck - CodeMan

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