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3.1.11.2.(1)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Blocking off [fire stopping] of concealed spaces within wall assemblies:
  • at every floor level, and
  • at every ceiling level where the ceiling forms part of an assembly required to have a fire-resistance rating.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A.
Exceptions: 
except as provided in Sentence 3.1.11.2.(2), which applies to insulated wall spaces, the use of noncombustible or low-flame-spread materials and insulation, and small air spaces.
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Intent
Intent 1: 
To limit the probability that concealed spaces within wall assemblies 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 concealed spaces will not remain in place for a certain minimum 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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