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Public corridors shall be fire-resistance rated in accordance with Table 1020.1.2.
TABLE 1020.1.2
PUBLIC CORRIDOR FIRE-RESISTANCE RATING
OCCUPANCY REQUIRED FIRE-RESISTANCE RATING
(hours)
H-1, H-2, H-3 2
H-4, H-5 1
A, E, F, M, S, U 1
B 1a
R (Noncombustible) 1c
R (Combustible) 2b
I-1, I-2, I-3, I-4 1
  1. Public corridors need not be fire rated in high-rise buildings in Occupancy Group B equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1, where such building is provided with smokeproof enclosures in stairways in accordance with Section 403.5.4.
  2. Public corridors in buildings not exceeding two stories in height, or that are three stories in height and occupied by not more than one family on each story, may be constructed with 1-hour fire-resistance rating.
  3. Corridors serving accessory rooms or spaces in Group R-2 occupancies pursuant to Section 1004.1.1.2.3 shall be constructed with fire barriers with 1-hour fire-resistance rating, and 2-hour fire-resistance rating where the dead-end distance exceeds 40 feet (12 192 mm) in length.

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