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  • CHAPTER6
    TYPES OF CONSTRUCTION

    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)3a2a1010HT10
    Bearing walls  Exteriore, f  Interior33a22a1100212021/HT1100
    Nonbearing walls and partitions ExteriorSee Table 602
    Nonbearing walls and partitions Interiord000000See Section 602.4.600
    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 shall not be required, including protection of 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 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.

    601.1 Scope.

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