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9.10.16.1.(6)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Maximum dimension of concealed spaces described in Clause 9.10.16.1.(5)(b) [compartments formed by the separation [fire stopping] of concealed spaces created by ceilings, roof spaces or unoccupied attic spaces, where such spaces contain exposed construction materials having a surface flame-spread rating greater than 25, that are not more than 300 m2 in area].
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are:
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Intent
Intent 1: 
To limit the probability that an extensive fire will develop in a large concealed roof or ceiling space where surface flame spread is likely to be relatively rapid, which could lead to the spread of fire to other parts of the building, which could lead to harm to persons.
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