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3.1.11.4.(1)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Fire stopping:
  • at all interconnections between concealed vertical and horizontal spaces in interior cove ceilings, drop ceilings and soffits in which the exposed construction materials within the space have a flame-spread rating more than 25, and
  • at the end of each run and at each floor level in concealed spaces between stair stringers in which the exposed construction materials within the space have a flame-spread rating more than 25.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A.
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Intent
Intent 1: 
To limit the probability that certain concealed 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 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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