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9.10.16.1.(5)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Separation into compartments [fire stopping] of concealed spaces created by ceilings, roof spaces or unoccupied attic spaces.
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 concealed spaces created by a ceiling, roof space or unoccupied attic space will not be separated into fire compartments, which could lead to the growth and spread of fire within these spaces, which could lead to harm to persons.
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