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3.3.4.4.(4)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Requirement in Sentence 3.3.4.4.(2) for an exit or egress door from the uppermost storey or the lowest storey of a dwelling unit [containing more than one storey], where that storey is served by a stairway that:
This applies to 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).
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Intent
Intent 1: 
To exempt the upper and lower levels of a multi-level dwelling unit from the application of Sentence 3.3.4.4.(2) relating to egress doorways from each storey, on the basis that the travel path [stairway] to a public access to exit is separated from the rest of the dwelling unit and is not shared with egress from another level.
This [the separation] is to limit the probability that fire will spread from other storeys in the dwelling unit to the stairway, which could lead to:
  • harm to persons using the stairway, or
  • the stairway becoming untenable, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
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