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SECTION 1021 NUMBER OF EXITS AND EXIT CONFIGURATION

1021.1 General.

Each story and occupied roof shall have the minimum number of exits, or access to exits, as specified in this section. The required number of exits, or exit access stairways or ramps providing access to exits, from any story shall be maintained until arrival at grade or a public way. Exits or access to exits from any story shall be configured in accordance with this section. Each story above the second story of a building shall have a minimum of one interior or exterior exit stairway, or interior or exterior exit ramp. At each story above the second story that requires a minimum of three or more exits, or access to exits, a minimum of 50 percent of the required exits shall be interior or exterior exit stairways, or interior or exterior exit ramps.

Exceptions:


1. Interior exit stairways and interior exit ramps are not required in open parking garages where the means of egress serves only the open parking garage.
2. Interior exit stairways and interior exit ramps are not required in outdoor facilities where all portions of the means of egress are essentially open to the outside.
1021.2 Exits from stories.
Two exits, or exit access stairways or ramps providing access to exits, from any story or occupied roof shall be provided where one of the following conditions exists:

1. The occupant load or number of dwelling units exceeds one of the values in Table 1021.2(1) or 1021.2(2).
2. The exit access travel distance exceeds that specified in Table 1021.2(1) or 1021.2(2) as determined in accordance with the provisions of Section 1016.1.
3. Helistop landing areas located on buildings or structures shall be provided with two exits, or exit access stairways or ramps providing access to exits.

Exceptions:
1. Rooms, areas and spaces complying with Section 1015.1 with exits that discharge directly to the exterior at the level of exit discharge, are permitted to have one exit.
2. Group R-3 occupancy buildings shall be permitted to have one exit.
3. Parking garages where vehicles are mechanically parked shall be permitted to have one exit.
4. Air traffic control towers shall be provided with the minimum number of exits specified in Section 412.3.
5. Individual dwelling units in compliance with Section 1021.2.3.
6. Group R-3 and R-4 congregate residences shall be permitted to have one exit.
7. Exits serving specific spaces or areas need not be accessed by the remainder of the story when all of the following are met:
7.1. The number of exits from the entire story complies with Section 1021.2.4;
7.2. The access to exits from each individual space in the story complies with Section 1015.1; and
7.3. All spaces within each portion of a story shall have access to the minimum number of approved independent exits based on the occupant load of that portion of the story, but not less than two exits.

TABLE 1021.2(1) STORIES WITH ONE EXIT OR ACCESS TO ONE EXIT FOR R-2 OCCUPANCIES


STORY OCCUPANCY MAXIMUM NUMBER OF DWELLING UNITS MAXIMUM EXIT ACCESS TRAVEL DISTANCE
Basement, first, second or third story R-2a, b 4 dwelling units 125 feet
Fourth story and above NP NA NA

For SI: 1 foot = 304.8 mm.
NP - Not Permitted
NA - Not Applicable
a. Buildings classified as Group R-2 equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 and provided with emergency escape and rescue openings in accordance with Section 1029.
b. This table is used for R-2 occupancies consisting of dwelling units. For R-2 occupancies consisting of sleeping units, use Table 1021.2(2).


TABLE 1021.2(2) STORIES WITH ONE EXIT OR ACCESS TO ONE EXIT FOR OTHER OCCUPANCIES


STORY OCCUPANCY MAXIMUM OCCUPANTS PER STORY MAXIMUM EXIT ACCESS TRAVEL DISTANCE
First story or basement A, Bb , E, Fb , M, U, Sb 49 occupants 75 feet
H-2, H-3 3 occupants 25 feet
H-4, H-5, I, R-1,
R-2a,c , R-4
10 occupants 75 feet
S 29 occupants 100 feet
Second story B, F, M, S 29 occupants 75 feet
Third story and above NP NA NA

For SI: 1 foot = 304.8 mm.
NP - Not Permitted
NA - Not Applicable
a. Buildings classified as Group R-2 equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 and provided with emergency escape and rescue openings in accordance with Section 1029.
b. Group B, F and S occupancies in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 shall have a maximum travel distance of 100 feet.
c. This table is used for R-2 occupancies consisting of sleeping units. For R-2 occupancies consisting of dwelling units, use Table 1021.2(1).
1021.2.1 Mixed occupancies.
Where one exit, or exit access stairway or ramp providing access to exits at other stories, is permitted to serve individual stories, mixed occupancies shall be permitted to be served by single exits provided each individual occupancy complies with the applicable requirements of Table 1021.2(1) or Table 1021.2(2) for that occupancy. Where applicable, cumulative occupant loads from adjacent occupancies shall be considered in accordance with the provisions of Section 1004.1.

In each story of a mixed occupancy building, the maximum number of occupants served by a single exit shall be such that the sum of the ratios of the calculated number of occupants of the space divided by the allowable number of occupants for each occupancy does not exceed one.
1021.2.2 Basements.
A basement provided with one exit shall not be located more than one story below grade plane.
1021.2.3 Single-story or multiple-story dwelling units.
Individual single-story or multiple-story dwelling units shall be permitted to have a single exit within and from the dwelling unit provided that all of the following criteria are met:
1. The dwelling unit complies with Section 1015.1 as a space with one means of egress and
2. Either the exit from the dwelling unit discharges directly to the exterior at the level of exit discharge, or the exit access outside the dwelling unit’s entrance door provides access to not less than two approved independent exits.
1021.2.4 Three or more exits.
Three exits, or exit access stairways or ramps providing access to exits at other stories, shall be provided from any story or occupied roof with an occupant load from 501 to and including 1,000. Four exits, or exit access stairways or ramps providing access to exits at other stories, shall be provided from any story or occupied roof with an occupant load greater than 1,000.
1021.2.5 Additional exits.
In buildings over 420 feet (128 m) in height, additional exits shall be provided in accordance with Section 403.5.2.
1021.3 Exit configuration.
Exits
, or exit access stairways or ramps providing access to exits at other stories, shall be arranged in accordance with the provisions of Sections 1015.2 through 1015.2.2. Exits shall be continuous from the point of entry into the exit to the exit discharge.

1021.3.1 Access to exits at adjacent levels.
Access to exits at other levels shall be by stairways or ramps. Where access to exits occurs from adjacent building levels, the horizontal and vertical exit access travel distance to the closest exit shall not exceed that specified in Section 1016.1. Access to exits at other levels shall be from an adjacent story.

Exception:
Landing platforms or roof areas for helistops that are less than 60 feet (18 288 mm) long, or less than 2,000 square feet (186 m2) in area, shall be permitted to access the second exit by a fire escape, alternating tread device or ladder leading to the story or level below.
1021.4 Vehicular ramps.
Vehicular ramps shall not be considered as an exit access ramp unless pedestrian facilities are provided.