ARCHIVED - 3.4.6.3.(3)

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3.4.6.3.(3)

Application

Intent

OS3


Objective	OS3 Safety in Use
Attribution	[F10,F12-OS3.7] [F30-OS3.1]
Application	Application 1: Size of landings, where a doorway or stairway empties onto a ramp through a side wall. 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 occupancy, including mezzanines as stated in Sentence 3.4.2.2.(1). Application 2: This also applies to: ramps, stairways and passageways 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 of 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 from being located above the first storey on any building, Sentence 3.1.6.2.(2), which prohibits air-supported structures from being 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 3.4.2.2.(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, 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), and Sentences 3.8.3.2.(1) and 3.8.3.3.(10), and Clauses 3.8.3.4.(1)(c) and (d), which apply to barrier-free design in buildings described in Sentence 3.8.1.1.(1).
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Intent	Intent 1: To limit the probability that landings in exit stairs will be of insufficient size to permit efficient egress in an emergency situation, which could lead to congestion at landings, 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 that emergency responders will have insufficient space on a landing to perform their duties, which could lead to delays or ineffectiveness 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 exiting onto a ramp will experience an immediate change in slope, which could lead to tripping or falling, which could lead to harm to persons.
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