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MEANS OF EGRESS

building shall be based on the sum of the occupant loads of dance with Section 903.3.1.1 or 903.3.1.2 and an
the building plus the outdoor areas. emergency voice/alarm communication system in
accordance with Section 907.5.2.2.
Exceptions:
1. Outdoor areas used exclusively for service of the 2. Facilities with smoke-protected assembly seating
building need only have one means of egress. shall be permitted to use the capacity factors in
Table 1029.6.2 indicated for stepped aisles for
2. Both outdoor areas associated with Group R-3 and exit access or exit stairways where the entire path
individual dwelling units of Group R-2.
for means of egress from the seating to the exit
1004.8 Concentrated business use areas. The occupant discharge is provided with a smoke control sys-
load factor for concentrated business use shall be applied to tem complying with Section 909.
telephone call centers, trading floors, electronic data pro- 3. Facilities with open-air assembly seating shall be
cessing centers and similar business use areas with a higher permitted to the capacity factors in Section
density of occupants than would normally be expected in a
typical business occupancy environment. Where approved 1029.6.3 indicated for stepped aisles for exit
access or exit stairways where the entire path for
by the building official, the occupant load for concentrated
business use areas shall be the actual occupant load, but not means of egress from the seating to the exit dis-
charge is open to the outdoors.
2
less than one occupant per 50 square feet (4.65 m ) of gross
occupiable floor space. 1005.3.2 Other egress components. The capacity, in
inches, of means of egress components other than stair-
1004.9 Posting of occupant load. Every room or space that ways shall be calculated by multiplying the occupant load
is an assembly occupancy shall have the occupant load of the served by such component by a means of egress capacity
room or space posted in a conspicuous place, near the main factor of 0.2 inch (5.1 mm) per occupant.
exit or exit access doorway from the room or space, for the
intended configurations. Posted signs shall be of an approved Exceptions:
legible permanent design and shall be maintained by the 1. For other than Group H and I-2 occupancies, the
owner or the owner’s authorized agent. capacity, in inches, of means of egress compo-
nents other than stairways shall be calculated by
multiplying the occupant load served by such
SECTION 1005 component by a means of egress capacity factor
MEANS OF EGRESS SIZING of 0.15 inch (3.8 mm) per occupant in buildings
1005.1 General. All portions of the means of egress system equipped throughout with an automatic sprinkler
shall be sized in accordance with this section. system installed in accor101.4.7dance with Sec-
tion 903.3.1.1 or 903.3.1.2 and an emergency
Exception: Aisles and aisle accessways in rooms or voice/alarm communication system in accor-
spaces used for assembly purposes complying with Sec- dance with Section 907.5.2.2.
tion 1029.
2. Facilities with smoke-protected assembly seating
1005.2 Minimum width based on component. The mini- shall be permitted to use the capacity factors in
mum width, in inches (mm), of any means of egress compo- Table 1029.6.2 indicated for level or ramped
nents shall be not less than that specified for such component, aisles for means of egress components other than
elsewhere in this code.
stairways where the entire path for means of
1005.3 Required capacity based on occupant load. The egress from the seating to the exit discharge is
required capacity, in inches (mm), of the means of egress for provided with a smoke control system complying
any room, area, space or story shall be not less than that deter- with Section 909.
mined in accordance with Sections 1005.3.1 and 1005.3.2: 3. Facilities with open-air assembly seating shall be
1005.3.1 Stairways. The capacity, in inches, of means of permitted to the capacity factors in Section
egress stairways shall be calculated by multiplying the 1029.6.3 indicated for level or ramped aisles for
occupant load served by such stairways by a means of means of egress components other than stairways
egress capacity factor of 0.3 inch (7.6 mm) per occupant. where the entire path for means of egress from
Where stairways serve more than one story, only the occu- the seating to the exit discharge is open to the
pant load of each story considered individually shall be outdoors.
used in calculating the required capacity of the stairways 1005.4 Continuity. The minimum width or required capacity
serving that story. of the means of egress required from any story of a building
Exceptions: shall not be reduced along the path of egress travel until
1. For other than Group H and I-2 occupancies, the arrival at the public way.
capacity, in inches, of means of egress stairways 1005.5 Distribution of minimum width and required
shall be calculated by multiplying the occupant capacity. Where more than one exit, or access to more than
load served by such stairways by a means of one exit, is required, the means of egress shall be configured
egress capacity factor of 0.2 inch (5.1 mm) per such that the loss of any one exit, or access to one exit, shall
occupant in buildings equipped throughout with not reduce the available capacity or width to less than 50 per-
an automatic sprinkler system installed in accor- cent of the required capacity or width.

260 2018 INTERNATIONAL BUILDING CODE ®
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