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3.3.4.2.(1)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Minimum fire-resistance rating of fire separations that separate suites of residential occupancy from each other and the remainder of the building.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1).
Exceptions: 
except as stated in:
  • Sentence 3.1.6.2.(1), which prohibits air-supported structures from being located above the first storey on any building,
  • Sentence 3.1.6.2.(2), which prohibits air-supported structures from being used for classrooms or for Groups B, C, or Group F, Division 1 major occupancies,
  • Sentence 3.1.6.2.(3), which requires air-supported structures to be designed as open floor spaces without interior walls, mezzanines, intermediate floors or similar construction,
  • Sentence 3.2.2.9.(2), which applies to floor assemblies immediately above crawl spaces, and
  • Sentence 3.3.4.2.(2), which applies when the fire-resistance rating required by Subsection 3.2.2. is permitted to be less than 1 h for:
    • the floor assembly above the floor area, or
    • the floor assembly below the floor area, if there is no floor assembly above.
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Intent
Intent 1: 
To limit the probability that fire will spread from one suite to another suite, or to another part of the building, which could lead to harm to persons in the other suite or part of the building.
Intent 2: 
To limit the probability that fire will spread from a suite to a corridor serving suites, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
Intent 3: 
To limit the probability that fire will spread from a suite to a corridor serving suites, which could lead to fire emergency response operations being delayed or ineffective, which could lead to:
  • delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons, and
  • the spread of fire to other parts of the building, which could lead to harm to persons.
Intent 4: 
To supersede the requirements for fire separations of suites and public corridors in Articles 3.3.1.1. and 3.3.1.4.
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