ARCHIVED - 3.4.3.2.(4)

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3.4.3.2.(4)

Application

Intent


Application	Application 1: Required exit width of exits serving 2 or more floor areas located one above the other. This applies to exits serving floor areas that are intended for occupancy, 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: tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1), and 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). 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 3.4.2.2.(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), Sentence 3.4.3.2.(6), which applies to interconnected floor spaces, and Sentence 3.8.1.3.(1), which applies to barrier-free design in buildings described in Sentence 3.8.1.1.(1).
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Intent	Intent 1: To exempt an exit stair from the application of Sentence 3.4.3.1.(2) for converging exits, which would otherwise require the exit width to be cumulative, based on the total occupant load of the superimposed storeys served by the exit, on the basis that exits need only be designed for a fire or other untenable conditions occurring on one floor area and the occupants moving from that floor area.
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