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Title: Section 1009  •  Size: 10615

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1009.1 General. Interior stairways, ramps or escalators shall be enclosed as specified in this section.

EXCEPTIONS: 1. In other than Groups H and I Occupancies, an enclosure need not be provided for a stairway, ramp or escalator serving only one adjacent floor. Any two such interconnected floors shall not be open to other floors. For enclosure of escalators serving Group B Occupancies, see Section 304.6.

2. Stairs in Group R, Division 3 Occupancies and stairs within individual dwelling units in Group R, Division 1 Occupancies need not be enclosed.

3. Stairs in open parking garages, as defined in Section 311.9, need not be enclosed.

1009.2 Enclosure Construction. Enclosure walls shall not be of less than two-hour fire-resistive construction in buildings four or more stories in height or of Types I and II fire-resistive construction and shall not be of less than one-hour fire-resistive construction elsewhere.

EXCEPTION: In sprinkler-protected parking garages restricted to the storage of private or pleasure-type motor vehicles, stairway enclosures may be enclosed with glazing meeting the requirements of Sections 713.7, 713.8 and 713.9.

1009.3 Openings into Enclosures. Openings into exit enclosures other than permitted exterior openings shall be limited to those necessary for exiting from a normally occupied space into the enclosure and exiting from the enclosure. Other penetrations into and opening through the exit enclosure are prohibited except for ductwork and equipment necessary for independent stair pressurization, sprinkler piping, standpipes and electrical conduit serving the stairway and terminating in a listed box not exceeding 16 square inches (10 323 ) in area. Penetrations and communicating openings between adjacent exit enclosures are not permitted regardless of whether the opening is protected.

All exit doors in an exit enclosure shall be protected by a fire assembly having a fire-protection rating of not less than one hour where one-hour enclosure construction is permitted in Section 1009.2 and one and one-half hours where two-hour enclosure construction is required by Section 1009.2. Doors shall be maintained self-closing or shall be automatic closing by actuation of a smoke detector as provided for in Section 713.2. The maximum transmitted temperature end point shall not exceed 450°F. (232°C.) above ambient at the end of 30 minutes of the fire exposure specified in U.B.C. Standard 7-2.

1009.4 Extent of Enclosure. Stairway and ramp enclosures shall include landings and parts of floors connecting stairway flights and shall also include a corridor or exit passageway on the ground floor leading from the stairway to the exterior of the building. Openings into the corridor or exit passageway shall comply with the requirements of Section 1009.3.

EXCEPTIONS: 1. Enclosed corridors or exit passageways are not required from unenclosed stairways or ramps.

2. In office buildings, a maximum of 50 percent of the exits may discharge through a street-floor lobby, provided the required exit width is free and unobstructed and the entire street floor is protected with an automatic sprinkler system.

1009.5 Barrier. A stairway in an exit enclosure shall not continue below the grade level exit unless an approved barrier is provided at the ground-floor level to prevent persons from accidentally continuing into the basement.

1009.6 Use of Space under Stair and Ramp. There shall be no enclosed usable space under stairways or ramps in an exit enclosure, nor shall the open space under such stairways be used for any purpose.

1009.7 Pressurized Enclosure. In a building having a floor used for human occupancy which is located more than 75 feet (22 860 mm) above the lowest level of fire department vehicle access, the entire required enclosure shall be pressurized in accordance with Section 905 of this code and this section. Pressurization shall occur automatically upon activation of an approved fire alarm system.

EXCEPTION: When the building is not equipped with a fire alarm system, pressurization shall be upon activation of a spot-type smoke detector listed for releasing service installed within 5 feet (1524 mm) of each vestibule entry.

The upper portion of such enclosures shall be provided with controlled relief vent capable of discharging a minimum of 2,500 cubic feet per minute (1180 L/s) of air at the design pressure difference.

Such enclosures shall be provided with a pressurized entrance vestibule.

1009.8 Vestibules. When required by Section 1009.7, vestibules shall meet the following requirements:

1. A level surface of not less than the area required by Section 1104.2 for two wheelchair spaces shall be provided. Such space shall not obstruct the required exit width and shall not interfere with access to or use of fire department hose connections and valves.

2. Two-way communication for the occupants shall be provided directly to the fire-control room.

3. Emergency illumination shall be provided to maintain a minimum of 30 footcandles (323 lx) on the floor.

4. An approved occupant-sensing device shall be provided. Such device shall visually indicate the presence of an occupant within the vestibule in an approved manner at the fire-control room.

5. Fire department connections and valves serving the floor shall be located within the vestibule and in such a manner as to not obstruct exiting when hose lines are connected and charged.

6. The minimum pressure differences within the vestibule with the doors closed shall be 0.05 inch water gage (12.44 Pa) positive pressure relative to the fire floor and 0.05 inch water gage (12.44 Pa) negative relative to the exit enclosure. No pressure difference is required relative to a nonfire floor.


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