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1019.3 Occupancies other than Groups H, I-2 and I-3.
In other than Group H, I-2 and I-3 occupancies, exit access stairways or ramps shall be enclosed with a shaft enclosure constructed in accordance with Section 713.
Exception: In other than Group H, I-2 and I-3 occupancies, exit access stairways or ramps that comply with one of the following conditions need not be enclosed:
1. A maximum of 50 percent of the exit access stairways and ramps that serve only two consecutive stories need not be enclosed, provided each such interconnected story has access to the minimum number of approved independent exits as required by Section 1006, and in no case be less than two means of egress. Such interconnected stories shall not be open to other stories. Unenclosed exit access stairways and ramps shall be remotely located in accordance with Section 1007.
2. In buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1, exit access stairways and ramps that serve between only the first and second stories above grade, provided the first and second stories have access to the minimum number of approved independent exits as required by Section 1006, and in no case be less than two means of egress. Such interconnected stories shall not be open to other stories. Unenclosed exit access stairways and ramps shall be remotely located in accordance with Section 1007.
3. In Group R-1, R-2 or R-3 occupancies that are fully sprinklered in accordance with Section 903.3.1.1, 903.3.1.2 or 903.3.1.3, exit access stairways and ramps connecting four stories or less and contained within an individual residential dwelling unit.
4. Exit access stairways and ramps in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1, where the area of the vertical opening between stories does not exceed twice the horizontal projected area of the stairway or ramp and the opening is protected by a draft curtain and closely spaced sprinklers in accordance with NFPA 13 as modified by Appendix Q. In other than Group B and M occupancies, this provision is limited to openings that do not connect more than four stories.
5. Exit access stairways and ramps within an atrium complying with the provisions of Section 404.
6. Exit access stairways and ramps in open parking garages that serve only the parking garage.
7. Exit access stairways and ramps serving open-air seating in buildings of Group A-5, where all portions of the means of egress are essentially open to the outside.
8. Exit access stairways and ramps serving the balcony, gallery or press box and the main assembly floor in occupancies such as theaters, places of religious worship, auditoriums and sports facilities.
1019.4 Group I-2 and I-3 occupancies.
In Group I-2 and I-3 occupancies, floor openings between stories containing exit access stairways or ramps are required to be enclosed with a shaft enclosure constructed in accordance with Section 713.
Exception: In Group I-3 occupancies, exit access stairways or ramps constructed in accordance with Section 408 are not required to be enclosed.
1020.1.1 Interior corridors.
Interior corridors shall be fire-resistance rated in accordance with Table 1020.1.1.
Exceptions:
1. A fire-resistance rating is not required for corridors in an occupancy in Group E where each room that is used for instruction has not less than one door opening directly to the exterior and rooms for assembly purposes have not less than one-half of the required means of egress doors opening directly to the exterior. Exterior doors specified in this exception are required to be at ground level and open to a public way.
2. A fire-resistance rating is not required for corridors contained within a dwelling unit or sleeping unit in an occupancy in Group R.
3. A fire-resistance rating is not required for corridors in open parking garages.
4. A fire-resistance rating is not required for corridors in an occupancy in Group B that is a space requiring only a single means of egress complying with Section 1006.2.
5. Corridors adjacent to the exterior walls of buildings shall be permitted to have unprotected openings on unrated exterior walls where unrated walls are permitted by Table 602 and unprotected openings are permitted by Table 705.8.
Occupancy | Occupant Load Served by Interior Corridor | Required Fire Resistance Rating (hours) | |
Without sprinkler system | With sprinkler system c | ||
Occupancy | Occupant Load Served by Interior Corridor | Required Fire Resistance Rating (hours) | |
Without sprinkler system | With sprinkler system c | ||
H-1, H-2, H-3 | All | Not Permitted | 1 |
H-4, H-5 | Greater than 30 | Not Permitted | 1 |
A, B, E, F, M,S, U | Greater than 30 | 1 | 0 |
R | Greater than 30 | 1
d
| 0 |
I-2
a
, I-4 | All | Not Permitted | 0 |
I-1, I-3 | All | Not Permitted | 1
b
|
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. Buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 where allowed.
d. Interior corridors within dwelling or sleeping units in Group R occupancies pursuant to Section 1020.1.1, Exception 2 shall not require fire-resistance rating.
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