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3.1.11.5.(1)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Separation into compartments [fire stopping] of horizontal concealed spaces within floor assemblies or roof assemblies of combustible construction, in which sprinklers are not installed, in buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies, as stated in Clause 3.1.5.3.(2)(c), to the separation into compartments of roof spaces where combustible roof sheathing and roof sheathing supports are installed above a concrete roof deck used in the construction of:
  • buildings or parts of buildings described in Sentence 1.3.3.2.(1) of Division A that are required to be of noncombustible construction, and
  • buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], as stated in Sentence 9.10.6.1.(1).
Exceptions: 
except for crawl spaces conforming to Sentence 3.1.11.6.(1).
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Intent
Intent 1: 
To limit the probability that certain spaces will not be separated from certain other parts of the building, which could lead to the spread of fire within these spaces, which could lead to harm to persons.
Intent 2: 
To limit the probability that fire stopping material used to block and separate certain spaces will not remain in place for a certain minimum amount of time when subjected to fire conditions, which could lead to the spread of fire within these spaces, which could lead to harm to persons.
Intent 3: 
To state the application of Article 3.1.11.7.
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