![]() For special requirements for Group S aircraft hangars, see Section 412.4.1.For special requirements for Group H occupancies, see Section 415.6.The fire-resistance rating of an exterior wall is determined based upon the fire separation distance of the exterior wall and the story in which the wall is located.Open parking garages complying with Section 406 shall not be required to have a fire-resistance rating.Load-bearing exterior walls shall also comply with the fire-resistance rating requirements of Table 601.Not less than the fire-resistance rating as referenced in Section 704.10. ![]() Not less than the fire-resistance rating based on fire separation distance (see Table 602). Not less than the fire-resistance rating required by other sections of this code. In all occupancies, heavy timber shall be allowed where a 1-hour or less fire-resistance rating is required. One- story portions of Group A and E assembly occupancies the roof-framing system of Type II A or Type III A construction may be of unprotected construction when such roof-framing system is open to the assembly area and does not contain concealed spaces. ![]() Fire-retardant- treated wood members shall be allowed to be used for such unprotected members. 2 For Group A, E, I, L, R-1, R-2, and R-2.1 occupancies, high-rise buildings, and other applications listed in Section 1.11 regulated by the Office of the State Fire Marshal, fire protection of members other than the primary structural frame 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. ![]() Except in Group A, E, F-1, H, I, L, M, R-1, R-2, R-2.1 and S-1 occupancies, high-rise buildings, and other applications listed in Section 1.11 regulated by the Office of the State Fire Marshal, fire protection of primary 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. 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. ![]()
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