ARCHIVED - 3.4.6.3.(5)

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3.4.6.3.(5)

Application

Intent

OS3


Objective	OS3 Safety in Use
Attribution	[F10,F12-OS3.7] [F30-OS3.1]
Application	Application 1: Location of landings in flights of stairs or sections of ramps. This applies--in buildings described in Sentence 1.3.3.2.(1) of Division A--to: interior and exterior exits, as stated in Appendix Note A-3.4.6., and exits serving floor areas that are intended for occupancies, including mezzanines as stated in Sentence 3.4.2.2.(1). Application 2: This also applies to: ramps and stairways used by the public as access to exits, as stated in Appendix Note A-3.4.6., tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1), stairs in a means of egress from a roof, where a roof is used or intended for an occupant load more than 60, as stated in Sentence 3.3.1.3.(4), ramps and stairways, as stated in Sentence 3.3.1.14.(1), and platforms in fire escapes, as stated in Sentence 3.4.7.7.(1). Exceptions: except as stated in: Sentence 3.1.6.2.(1), which prohibits air-supported structures to be located above the first storey on any building, Sentence 3.1.6.2.(2), which prohibits air-supported structures to be used for classrooms or for Groups B, C, or Group F, Division 1 major occupancies, Sentence 3.1.6.2.(3), which requires air-supported structures to be designed as open floor spaces without interior walls, mezzanines, intermediate floors or similar construction, Sentence 3.3.1.3.(5), which applies to rooftop enclosures, Sentence 3.3.1.14.(2), which applies to service rooms, service spaces and industrial occupancies, Subsection 3.3.2., which applies to assembly occupancies, Sentence 3.3.4.7.(1), which applies to dwelling units, Sentence 3.4.2.2.(2), which applies to mezzanines that: are not required to terminate at a vertical fire separation [see Article 3.2.8.1.], are not intended for an occupant load more than 60, do not exceed the area limits for rooms and suites in Table 3.4.2.2., and have limited travel distances to egress doors or stairs, and Sentence 3.4.2.2.(3), which applies to at least half of the required means of egress from a mezzanine if the mezzanine is not required to terminate at a fire separation as permitted by Sentence 3.2.8.2.(1).
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Intent	Intent 1: To limit the probability of an abrupt change in gait occurring at the top and bottom of exit stairs or sections of ramps, which could lead to inefficient egress in an emergency situation, which could lead to congestion, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons. Intent 2: To limit the probability of an abrupt change in gait occurring at the top and bottom of exit stairs or sections of ramps, which could lead to congestion, which could lead to delays or inefficiencies in emergency response operations, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons. Intent 3: To limit the probability that a person will not have a level place to stand while opening a door or reaching for a handrail, which could lead to tripping or falling, which could lead to harm to persons.
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