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9.10.16.1.(2)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Separation [fire stopping] of horizontal concealed spaces in attics, roof spaces, ceilings, floors, and crawl spaces from:
  • other horizontal concealed spaces, and
  • vertical concealed 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].
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Intent
Intent 1: 
To limit the probability that concealed spaces in attics, roof spaces, ceilings, floors, and crawl spaces will not be separated from certain other concealed spaces, which could lead to the spread of fire within these spaces, which could lead to harm to persons.
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