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3.2.3.7.(5)
OP3
ObjectiveOP3 Protection of Adjacent Buildings from Fire
Attribution
Application
Application 1: 
Minimum fire-resistance rating and combustibility of exterior cladding of an exposing building face, where a limiting distance shown in Tables 3.2.3.1.B. or 3.2.3.1.D. for a Group E, or Group F, Division 1 or 2 occupancy classification permits an exposing building face to have unprotected openings consisting of more than 10% but not more than 25% of the exposing building face.
Exceptions: 
except as exempted in:
  • Sentence 3.2.3.7.(7), which applies to wall assemblies that comply with the requirements of Article 3.1.5.5.,
  • Sentence 3.2.3.8.(3), which applies to the exterior cladding of structural members of heavy timber construction placed outside of an exterior face of a building, and
  • Article 3.2.3.10., which applies to a storage garage or a storey that faces a street and is at the same level as the street.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to exterior walls enclosing an attic or roof space located above an exposing building face, as stated in Sentence 3.2.3.3.(1).
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Intent
Intent 1: 
To limit the probability that an exposing building face will have insufficient fire resistance, which could lead to the spread of fire from the building to an adjacent building during the time required for emergency responders to perform their duties, which could lead to damage to adjacent buildings.
Intent 2: 
To limit the probability that exterior cladding will be ignited and contribute to, or be involved in, a fire, which could lead to the spread of fire from the building to an adjacent building during the time required for emergency responders to perform their duties, which could lead to damage to adjacent buildings.
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