City letter 5-10-07 Code attachment.pdf05/10/2007 06:56 FAX 2064410476 MAHLUM ARCHITECTS
is greater than 12 inches (305 mm), the lowest edge of such
sign or obstruction shall be 27 inches (685 trim) maximum
or 80 inches (2030 mm) minimum above the finished floor
or ground.
Exception; This requirement shall not apply to sloping
portions of handrails serving stairs and ramps.
1003.3,3 Horizontal projections. Structural elements, fix-
tures or furnishings shall not project horizontally from
either side more than 4 inches (102 mm) over any walking
surface between the heights of 27 inches (686 nun) and 80
inches (2032 mm) above the walking surface.
Exception: Handrails serving stairs and ramps are per-
mitted to protrude 4.5 inches (114 nun) from the wall.
1003,3.4 Clear width. protruding objects shall not reduce
the minimum clear width of accessible routes as required in
Section 1104,
1003.4 Floor surface. Walling surfaces of the means of egress
shall have a slip -resistant surface and be securely attached.
1003.5 Elevation change. Where changes in elevation of less
than 12 inches (305 mm) exist in the means of egress, sloped
surfaces shall be used. Where the slope is greater than one unit
vertical in 20 units horizontal (5 -percent slope), ramps comply-
ing with Section 1030 shall be used, Where the difference in
elevation is 6 inches (152 mm) or less, the ramp shall be
equipped with either handrails or floor finish materials that
contrast with adjacent floor finish materials.
Exceptions:
L A single step with a maximum riser height of 7 inches
(178 mm) is permitted for buildings with occupancies
in Groups F. H, R-2 and R-3 and Groups S and U at
exterior doors not required to be accessible by Chap-
ter 1 I.
AR
with a single riser or with two risers and a tread
MM 's permitted at locations not required to be accessible
by Chapter 11, provided that the risers and treads
yi'� comply with Section 1009.3, the minimum depth of
the tread is 13 inches (330 mm) and at least one hand.
SLOCnyLNAg with Section 1012 is provided within
��F,`� MEhr3Jl complyinc�30 inches (762 nam) of the centerline of the normal
path of egress travel on the stair.
3. A step is permitted in aisles serving seating that has a
difference in elevation less than 12 inches (305 mat)
at locations not required to be accessible by Chapter
11, provided that the risers and treads comply with
Section 1025.11 and the aisle is provided with a hand-
rail complying with Section 1025.13.
Any change in elevation in a corridor serving
nonambulatory persons in a Group 1-2 occupancy shall be by
means of a ramp or sloped walkway,
1003.6 .Means of egress continuity. The path of egress travel
along a means of egress shall not be interrupted by any building
clement other than a means of egress component as specified in
this chapter. Obstructions shall not be placed in the required
width of a means of egress except projections permitted by this
chapter. The required capacity of a means of egress system
shall not be diminished along the path of ogress travel.
Z 002/002
MEANS OF EGRESS
1003.7 Elevators, escalators and moving waM. Elevators,
escalators and moving walks shall not beused as a component of
a required means of egress from any other part of the building.
Exception: Elevators used as an accessible means of egress
in accordance with Section 1007.4.
SECTION 1004
OCCUPANT LOAD
1004.1 Design occupant load. In determining means of egress
requirements, the number of occupants for whom means of
egress facilities shall be provided shall be determined in accor-
dance with this section. Where occupants from accessory areas
egress through a primary space, the calculated occupant load
for the primary space shall include the total occupant load of
the primary space plus the number of occupants egressing
through it from the accessory area.
1004.1,1 Ameas without fixed seating. The number of
occupants shall be computed at the rate of one occupant per
unit of area as prescribed in Table 1004.1.1. For areas with-
out fixed seating, the occupant load shall not be less than
that number determined by dividing the floor area under
consideration by the occupant per unit of area factor
assigned to the occupancy as set forth in Table 1004.1.1.
Where an intended use isnot listed in Table 1004.1.1, the
building official shall establish 3 use based on a listed use
that most nearly resembles the intended use.
Exception: Where approved by the building official, the
actual number of occupants for whom each occupied
space, floor or building is designed, although less than
those determined by calculation, shall be permitted to be
used in the determination of the design occupant load.
1004.2 Increased occupant load. Theoccupant load permitted in
any building, or portion thereof, is permitted to be increased from
that number established for rhe occupancies in able 1004.1.1,
provided that all other requirements of the code are also met
based on such modified number and the occupant load does not
exceed one occupant per 7 square feet (0.65 Ina) of occupiable
floor space. Where required by the building official, an approved
aisle, seating or fixed equipment diagram substantiating any
increase in occupant load shall be submitted. Where required by
the building official, such diagram shall be posted.
1404.3 Posting of occupant load. Every room or space that is
an assembly occupancy shall have the occupant load of the
room or space posted in a conspicuous place, near the main exit
or exit access doorway from the room or space. Posted signs
shall be of an approved legible permanent design and shall be
maintained by the owner or authorized agent,
1004.4 Exiting from multiple levels. Where exits serve more
than one floor, only tha occupant load of each floor considered
individually shall be used in computing the required capacity
of the exits at that floor, provided that the exit capacity shall not
decrease in the direction of egress travel.
14045 Egress convergence. Where means of egress from
floors above and below converge at an intermediate level, the
capacity of the means of egress from the point of convergence
shall not be less than the sum of the two floors.
2006 INTERNATIONAL BUILDING CODE 203
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