Page 227 - 2018_IFC

MEANS OF EGRESS

[BE] 1029.14.1.3 Edge protection. Ramped aisles tion of each tread is readily apparent when viewed in
shall have edge protection in accordance with Sections descent. Such stripe shall be not less than 1 inch (25
1012.10 and 1012.10.1. mm), and not more than 2 inches (51 mm), wide.
Exception: In assembly spaces with fixed seating, Exception: The contrasting marking stripe is per-
edge protection is not required on the sides of mitted to be omitted where tread surfaces are such
ramped aisles where the ramped aisles provide that the location of each tread is readily apparent
access to the adjacent seating and aisle accessways. when viewed in descent.
[BE] 1029.14.2 Stepped aisles. Aisles with a slope [BE] 1029.14.2.4 Nosing and profile. Nosing and riser
exceeding one unit vertical in eight units horizontal (12.5- profile shall comply with Sections 1011.5.5 through
percent slope) shall consist of a series of risers and treads 1011.5.5.3.
that extends across the full width of aisles and complies [BE] 1029.15 Seat stability. In a building, room or space
with Sections 1029.14.2.1 through 1029.14.2.4. used for assembly purposes, the seats shall be securely fas-
[BE] 1029.14.2.1 Treads. Tread depths shall be not tened to the floor.
less than 11 inches (279 mm) and shall have dimen- Exceptions:
sional uniformity.
1. In a building, room or space used for assembly pur-
Exception: The tolerance between adjacent treads poses or portions thereof without ramped or tiered
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shall not exceed / inch (4.8 mm). floors for seating and with 200 or fewer seats, the
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[BE] 1029.14.2.2 Risers. Where the gradient of seats shall not be required to be fastened to the floor.
stepped aisles is to be the same as the gradient of 2. In a building, room or space used for assembly pur-
adjoining seating areas, the riser height shall be not less poses or portions thereof with seating at tables and
than 4 inches (102 mm) nor more than 8 inches (203 without ramped or tiered floors for seating, the seats
mm) and shall be uniform within each flight. shall not be required to be fastened to the floor.
Exceptions: 3. In a building, room or space used for assembly pur-
1. Riser height nonuniformity shall be limited to poses or portions thereof without ramped or tiered
the extent necessitated by changes in the gra- floors for seating and with greater than 200 seats, the
dient of the adjoining seating area to maintain seats shall be fastened together in groups of not less
adequate sightlines. Where nonuniformities than three or the seats shall be securely fastened to
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exceed / inch (4.8 mm) between adjacent the floor.
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risers, the exact location of such nonuniformi- 4. In a building, room or space used for assembly pur-
ties shall be indicated with a distinctive mark- poses where flexibility of the seating arrangement is
ing stripe on each tread at the nosing or an integral part of the design and function of the
leading edge adjacent to the nonuniform ris- space and seating is on tiered levels, not more than
ers. Such stripe shall be not less than 1 inch 200 seats shall not be required to be fastened to the
(25 mm), and not more than 2 inches (51 mm), floor. Plans showing seating, tiers and aisles shall be
wide. The edge marking stripe shall be distinc- submitted for approval.
tively different from the contrasting marking
stripe. 5. Groups of seats within a building, room or space
used for assembly purposes separated from other
2. Riser heights not exceeding 9 inches (229 seating by railings, guards, partial height walls or
mm) shall be permitted where they are neces- similar barriers with level floors and having not
sitated by the slope of the adjacent seating more than 14 seats per group shall not be required to
areas to maintain sightlines. be fastened to the floor.
[BE] 1029.14.2.2.1 Construction tolerances. The 6. Seats intended for musicians or other performers
tolerance between adjacent risers on a stepped aisle and separated by railings, guards, partial height
that were designed to be equal height shall not walls or similar barriers shall not be required to be
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exceed / inch (4.8 mm). Where the stepped aisle is fastened to the floor.
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designed in accordance with Exception 1 of Section
1029.14.2.2, the stepped aisle shall be constructed [BE] 1029.16 Handrails. Ramped aisles having a slope
so that each riser of unequal height, determined in exceeding one unit vertical in 15 units horizontal (6.7-percent
3
the direction of descent, is not more than / inch slope) and stepped aisles shall be provided with handrails in
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(9.5 mm) in height different from adjacent risers compliance with Section 1014 located either at one or both
where stepped aisle treads are less than 22 inches sides of the aisle or within the aisle width.
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(560 mm) in depth and / inch (19.1 mm) in height Exceptions:
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different from adjacent risers where stepped aisle 1. Handrails are not required for ramped aisles with
treads are 22 inches (560 mm) or greater in depth. seating on both sides.
[BE] 1029.14.2.3 Tread contrasting marking stripe. 2. Handrails are not required where, at the side of the
A contrasting marking stripe shall be provided on each aisle, there is a guard with a top surface that com-
tread at the nosing or leading edge such that the loca-

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