Corridors.
Municipal Code of Chicago § 14B-10-1020
in effect14B-10-1020 Corridors.
The provisions of Section 1020 of IBC are adopted by reference with the following modifications:
1. Delete exception 1 to Section 1020.1.
2. Replace Table 1020.1 as shown:
TABLE 1020.1
CORRIDOR FIRE-RESISTANCE RATING
OCCUPANCY | OCCUPANT LOAD SERVED BY CORRIDOR | REQUIRED FIRE-RESISTANCE RATING (hours)
Without sprinkler system | With sprinkler system
OCCUPANCY | OCCUPANT LOAD SERVED BY CORRIDOR | REQUIRED FIRE-RESISTANCE RATING (hours)
Without sprinkler system | With sprinkler system
H-1, H-2, H-3 | All | Not Permitted | 1
H-4, H-5 | Greater than 30 | Not Permitted | 1
A, B, F, M, S, U | Greater than 30 | 1 | 0 e
E | All | 1 | 1
R | Greater than 10 | 1 | 1
I-2 a | All | Not Permitted | 0
I-1, I-3 | All | Not Permitted | 1 b
I-4 | All | 1 | 0
a. For requirements for occupancies in Group I-2, see Sections 407.2 and 407.3.
b. For a reduction in the fire-resistance rating for occupancies in Group I-3, see Section 408.8.
c. [Reserved.]
d. [Reserved.]
e. In Groups A-1, A-2, A-3, and A-4 occupancies, corridors serving and visually separated from a room or suite of rooms with an occupant load of 300 or more shall have a fire-resistance rating of not less than 1 hour.
2.1. Revise Section 1020.1.1 by replacing "Section 3006.2.1" with "Section 3002.1.1."
3. Replace Table 1020.2 as shown:
TABLE 1020.2
MINIMUM CORRIDOR WIDTH
OCCUPANCY | MINIMUM WIDTH (inches)
OCCUPANCY | MINIMUM WIDTH (inches)
Any facility not listed in this table | 44
Access to and utilization of mechanical, plumbing or electrical systems or equipment | 24
With an occupant load of less than 50 | 36
Within or serving a single dwelling unit | 36
In Group E-1 corridors serving classrooms, study rooms or assembly rooms | 60 a
In corridors and areas serving stretcher traffic in ambulatory care facilities | 72
Group I-2 in areas where required for bed movement | 96
For SI: 1 inch = 25.4 mm.
a. When lockers are installed in corridors, the full required clear width of the corridor shall be provided between locker doors when open.
4. Revise exception 2 to Section 1020.4 to read:
"2. In occupancies in Groups B, E-2, F, I-1, M, R, S and U, where the building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1, the length of the dead-end corridors shall not exceed 50 feet (15 240 mm)."
5. Revise Section 1020.5 including its exceptions to read:
“1020.5 Air movement in corridors.
Air movement in corridors shall comply with Section 601.2 of the Chicago Mechanical Code.”
6. [Reserved.]
7. Delete Section 1020.5.1.
8. Add a new Section 1020.7 to read:
"1020.7 Toilet rooms.
Separation shall not be required between a toilet room and a fire-resistance-rated corridor where the toilet room meets the following criteria:
1. The toilet room shall be separated from the remainder of the building by fire-resistance-rated construction meeting the requirements of Section 1020.1.
2. The toilet room shall not directly connect to any habitable space.
3. The toilet room shall not contain any fuel-fired equipment or appliances."
(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 49; Amend Coun. J. 10-7-20, p. 21791, Art. II, § 24; Amend Coun. J. 1-24-24, p. 8634, Art. IV, § 4; Amend Coun. J. 6-17-26, p. 45214, Art. IV, § 33)
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2665038Fetched: 10/24/2026