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  • CHAPTER6
    TYPES OF CONSTRUCTION

    User note:

    About this chapter: Chapter 6 establishes five types of construction in which each building must be categorized. This chapter looks at the materials used in the building (combustible or noncombustible) and the extent to which building elements such as building frame, roof, wall and floor can resist fire. Depending on the type of construction, the specific building element and its proximity to a lot line, fire resistance of 1 to 3 hours is specified.

    SECTION601
    GENERAL

    TABLE 601

    FIRE-RESISTANCE RATING REQUIREMENTS FOR BUILDING ELEMENTS (HOURS)

    BUILDING ELEMENTTYPE ITYPE IITYPE IIITYPE IVTYPE V
    ABABABHTAB
    Primary structural framef (see Section 202)3a, b2a, b1b01b0HT1b0
    Bearing walls Exteriore, f Interior33a22a1100212021/HT1100
    Nonbearing walls and partitionsExteriorSee Table 602
    Nonbearing walls and partitions Interiord000000See Section 2304.11.200
    Floor construction and associated secondary members (see Section 202)221010HT10
    Roof construction and associated secondary members (see Section 202)11/2b1b,c1b,c0c1b,c0HT1b,c0

    For SI: 1 foot = 304.8 mm.

    1. a.Roof supports: Fire-resistance ratings of primary structural frame and bearing walls are permitted to be reduced by 1 hour where supporting a roof only.

    2. b.Except in Group F-1, H, M and S-1 occupancies, fire protection of structural members in roof construction shall not be required, including protection of primary structural frame members, roof framing and decking where every part of the roof construction is 20 feet or more above any floor immediately below. Fire-retardant-treated wood members shall be allowed to be used for such unprotected members.

    3. c.In all occupancies, heavy timber complying with Section 2304.11 shall be allowed where a 1-hour or less fire-resistance rating is required.

    4. d.Not less than the fire-resistance rating required by other sections of this code.

    5. e.Not less than the fire-resistance rating based on fire separation distance (see Table 602).

    6. f.Not less than the fire-resistance rating as referenced in Section 704.10.

    601.1Scope.

    The provisions of this chapter shall control the classification of buildings as to type of construction.

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