601.1 Scope.
BC § 601.1
The provisions of this chapter shall control the classification of buildings as to type of construction. Table 601Fire-Resistance Rating Requirements for Building Element (hours) Building ElementType IType IIType IIIType IV iType V iAB A BA BHT ABBuilding ElementType IType IIType IIIType IV iType V iAB A BA BHT ABPrimary structural frame f (see Section 202)3 a 2 a, j1 j0 1 0 HT 1 0 Bearing walls Exterior e, f, g Interior3 3 a 2 2 a 1 1 0 0 2 1 2 0 2 1/HT 1 1 0 0 Nonbearing walls and partitions ExteriorSee Table 602 Nonbearing walls and partitions Interior d0 0 0 0 0 0 See Section 602.4.6 0 0 Floor construction h and associated secondary members (see Section 202) 2 2 1 0 1 0 HT 1 0 Roof construction and associated secondary members (see Section 202) 1 1/2 b, c 1 b, c 1 b, c 0 c 1 b, c 0 HT 1 b, c 0 For SI: 1 foot = 304.8 mm. 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. b.
1.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 within any portion of the roof, 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.
2.Except in Group F occupancies subject to regulation under Sections 264(1) and 264(2) of the New York State Labor Law, and in Group I-1, R-1, and R-2 occupancies, in Types I and II construction, fire-retardant-treated wood shall be allowed in buildings including girders and trusses as part of the roof construction when the building is: i. Type II construction of any height; or ii. Type I construction two stories or less; or when over two stories, the vertical distance from the upper floor to the roof is 20 feet or more. c. Except in Group F occupancies subject to regulation under Sections 264(1) and 264(2) of the New York State Labor Law, and in Group I-1, R-1 and R-2 occupancies, heavy timber shall be allowed where a 1-hour or less fire-resistance rating is required. d. Not less than the fire-resistance rating required by other sections of this code. e. Not less than the fire-resistance rating based on fire separation distance (see Table 602). f. Not less than the fire-resistance rating as referenced in Section 704.10. g. See note g of Table 602. h. See Section 711.2.4 for additional requirements. i. Type V construction is not permitted inside fire districts except as provided for in Section D105.1 of Appendix D. j. See Section 403.2.1 for additional requirements for high-rise buildings and fire-resistance rating of columns in such buildings. Table 602 Fire-Resistance Rating Requirements for Exterior Walls Based on Fire Separation Distance a, e, g, h, j Fire SeparationDistance = X (feet) Type of Construction Occupancy Group H f Occupancy GroupF-1, M, S-1 g, i Occupancy GroupA, B, E, F-2, I, R, S-2, U b X < 5 c All 3 2 1 5 ≤ X < 10 IAOthers 32 2 1 1 1 10 ≤ X < 30 IA, IBIIB, VBOthers 2 1 1 1 0 1 1 d 0 1 d X ≥ 30 All 0 0 0 For SI: 1 foot = 304.8 mm. a. Load-bearing exterior walls shall also comply with the fire-resistance rating requirements of Table 601. b. Group U when used as accessory to Group R-3 shall not be required to have a fire-resistance rating where the fire separation distance is 5 feet or more for free standing private garages in compliance with Section 406.1, and when the separation distance is 3 feet or more for other free-standing Group U buildings. For free standing private garages where the fire separation distance is less than 5 feet, refer to Section 406.3.4 for required fire-resistance rating for exterior walls. c. See Section 706.1.1 for party walls. d. Open parking garages complying with Section 406 shall not be required to have a fire-resistance rating. e. 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. f. For special requirements for Group H occupancies, see Section 415.6. g. Inside the fire district, exterior load bearing walls of Type II buildings shall have a fire-resistance rating not less than prescribed below: X < 5 2 hours 5 ≤ X < 10 2 hours 10 ≤ X < 30 1 hour X ≥ 30 As per Table 602. h. Inside the fire district, exterior non-load bearing walls of Type II buildings shall have a fire resistance rating not less than prescribed below: X < 5 As per Table 602 5 ≤ X < 10 As per Table 602 10 ≤ X < 30 1 hour X ≥ 30 As per Table 602. i. For special requirements for Group S aircraft hangars, see Section 412.4.1. j. Where Table 705.8 permits nonbearing exterior walls with unlimited area of unprotected openings, the required fire-resistance rating for the exterior walls is 0 hours.
