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9.10.8.3.(1)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Minimum fire-resistance rating of loadbearing walls, columns and arches in the storey immediately below [and supporting] a floor or roof assembly, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except as stated in:
  • Sentence 9.10.8.5.(1), which applies to construction supporting a service room, and
  • Sentence 9.10.8.11.(1), which applies to loadbearing walls, columns and arches that conform to the appropriate requirements in Section 3.2.
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Intent
Intent 1: 
To limit the probability that loadbearing walls, columns and arches exposed to fire will fail or collapse prematurely, which could lead to the failure or collapse of the floor or roof assembly above during the time required to achieve occupant safety and for emergency responders to perform their duties, which could lead to harm to persons.
Intent 2: 
To limit the probability that loadbearing walls, columns and arches exposed to fire will fail or collapse prematurely, which could lead to the failure or collapse of the floor assembly above, which could lead to the spread of fire from a lower storey of a building to an upper storey or to the exterior during the time required to achieve occupant safety and for emergency responders to perform their duties, which could lead to harm to persons.
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