Code of Massachusetts Regulations
780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS
Chapter 6 - Types of Construction
Section 602 - CONSTRUCTION CLASSIFICATION
Current through Register 1531, September 27, 2024
TABLE 602 FIRE-RESISTANCE RATING REQUIREMENTS FOR EXTERIOR WALLS BASED ON FIRE SEPARATION DISTANCEa, e
| FIRE SEPARATION DISTANCE = X (feet) | TYPE OF CONSTRUCTION | OCCUPANCY GROUP Hf | OCCUPANCY GROUP F-1, M,S-1g | OCCUPANCY GROUP A, B, E, F-2, I, R,S-2g, Ub |
| X < 5c | All | 3 | 2 | 1 |
| 5 <= X< 10 | IA | 3 | 2 | 1 |
| Others | 2 | 1 | 1 | |
| 10 <= X< 30 | IA, IB | 2 | 1 | 1d |
| IIB, VB | 1 | 0 | 0 | |
| Others | 1 | 1 | 1d | |
| 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. For special requirements for Group U occupancies, see Section 406.1.2. 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 415.3. g. For special requirements for Group S aircraft hangars, see Section 412.4.1. |
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