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9.9.4.2.(2)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Fire-resistance rating required in Sentence 9.9.4.2.(1) [minimum fire-resistance rating of fire separations that separate exits from adjacent floor areas and from other exits ], where there is no floor assembly above the floor area, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except:
  • for exterior doorways,
  • for exits that serve not more than one dwelling unit, as stated in Sentence 9.9.4.1.(1),
  • as stated in Sentence 9.9.4.2.(5), which applies to exterior exit passageways,
  • as stated in Sentence 9.9.4.4.(1), which applies to openings near unenclosed exit stairs and ramps,
  • as stated in Sentence 9.9.4.7.(1), which applies to stairways in 2-storey Group D or E buildings, and
  • as stated in Article 9.9.8.5., which applies to exits through lobbies.
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Intent
Intent 1: 
To limit the probability that fire will spread into an exit, 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 fire will spread from one floor area to another floor area by means of an exit, which could lead to harm to persons in the other floor area.
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