IBC section 1018 and all subsections are deleted in their
entirety and replaced with the following:
SECTION 1018
AISLES
1018.1
Aisles and aisle accessways. Aisles and aisle accessways serving
as a portion of the exit access in the means of egress system shall comply with
the requirements of this section. Aisles and aisle accessways shall be provided
from all occupied portions of the exit access. Aisles and aisle accessways
serving assembly areas, other than seating at tables, shall comply with Section
1029. Aisles and aisle accessways serving reviewing stands, grandstands, and
bleachers shall comply with Section 1029.
1018.2
Width determination.
Where tables or counters are served by fixed seats, the width of the aisle or
aisle accessway shall be measured from the back of the seat. Where seating is
located at a table or counter and is adjacent to an aisle or aisle accessway,
the measurement of required clear width of the aisle or aisle accessway shall
be made to a line 19 inches (483 mm) away from and parallel to the edge of the
table or counter. The 19-inch (483 mm) distance shall be measured perpendicular
to the side of the table or counter. In the case of other side boundaries for
aisle or aisle accessways, the clear width shall be measured to walls, tread
edges, or other obstructions.
The required width of aisles and aisle accessways shall be
unobstructed.
Exception: Doors, when fully opened, and
handrails shall not reduce the required width by more than 7 inches (178 mm).
Doors in any position shall not reduce the required width by more than
one-half. Other nonstructural projections, such as trim and similar decorative
features, are permitted to project into the required width 1.5 inches (38 mm)
from each side.
1018.2.1
Minimum
aisle accessway width. Aisle accessways not required to be accessible
by Minnesota Rules, chapter 1341, the Minnesota Accessibility Code, shall
provide a minimum of 12 inches (305 mm) of width, plus 0.5 inches (12.7 mm) of
width for each additional one foot (305 mm), or fraction thereof, beyond 12
feet (3658 mm) of aisle accessway length.
Exception: Portions of an aisle accessway having
a length not exceeding six feet and used by a total of not more than four
persons.
1018.2.2
Minimum aisle width. The minimum clear width shall be determined
by Section 1005.1 for the occupant load served, but shall not be less than 36
inches (914 mm).
Exception: Nonpublic aisles serving fewer than 50
people, and that are not required to be accessible by Minnesota Rules, chapter
1341, need not exceed 28 inches (711 mm) in width.
1018.3
Length.
1018.3.1
Aisle accessway. The
length of travel along the aisle accessway shall not exceed 30 feet (9144 mm)
to an aisle or exit access doorway.
1018.3.2
Aisle. The length of
travel along an aisle or combination aisle accessway and aisle to a point where
a person has a choice of two or more paths of egress travel to separate exits
or exit access doorways shall not exceed that permitted by Section 1006.2.1 for
common path of egress travel.
Subpart
1.
IBC Table 1018.1.
IBC Table 1018.1 is amended as follows:
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OCCUPANCY
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OCCUPANT LOAD SERVED BY CORRIDOR
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REQUIRED FIRE-RESISTANCE RATING (hours)
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Without sprinkler system
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With sprinkler system
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H-1, H-2, H-3
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All
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Not permitted
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1
|
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H-4, H-5
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Greater than 30
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Not permitted
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1
|
|
A, B, E, F, M, S, U
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Greater than 30
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1
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0
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|
R
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Greater than 10
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1
|
05
|
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I-2a, I-4
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All
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Not permitted
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0
|
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I-1, I-3
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All
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Not permitted
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1b
|
a. For
requirements for occupancies in Group I-2, see sections 407.2 and
407.3.
b. For a reduction in the
fire-resistance rating for occupancies in Group I-3, see section
408.8.
c. Buildings equipped
throughout with an automatic sprinkler system in accordance with section
903.3.1.1 or 903.3.1.2, where allowed.
Subp. 2.
IBC section 1018.6.
IBC section 1018.6 is amended by modifying the exceptions to
read as follows:
Exceptions:
1. Foyers, lobbies, or reception rooms
constructed as required for corridors shall not be construed as intervening
rooms if the aggregate area of these spaces does not exceed 1,000 square feet
per floor.
2. Foyers, lobbies, or
reception rooms that are more than 1,000 square feet per floor in aggregate
area and other rooms or spaces that are constructed as required for corridors
shall not be construed as intervening rooms when the rooms or spaces meet the
following:
(a) The spaces are not occupied as
dwelling units, sleeping units, incidental uses or hazardous uses.
(b) The rooms, spaces, or corridors are
protected by an automatic smoke detection system that initiates alarm
notification devices in all normally occupied rooms or spaces that use the
corridor for a means of egress.
(c)
The room or space is arranged so that it does not obstruct access to the
required exits.
(d) Group R
occupancies shall be provided with an automatic sprinkler system throughout to
allow the use of exception #2.
