ARCHIVED - 3.4.3.4.(2)

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3.4.3.4.(2)

Application

Intent


Application	Application 1: Method for measuring headroom clearance for stairways. This applies to exits serving floor areas that are intended for occupancies, including mezzanines as stated in Sentence 3.4.2.2.(1), in buildings described in Sentence 1.3.3.2.(1) of Division A. Application 2: This also applies to: access to exits, as stated in Sentence 3.3.1.8.(1), tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1), stairways, as stated in Sentence 3.3.1.14.(1), and 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). 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, 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 clarify the means to measure the headroom clearance for a stairway.
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