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5.4.1.2.(3)
OH1OS2OS1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Joints and junctions in air barrier systems and penetrations through air barrier systems in, and at interfaces between, building assemblies described in Sentence 5.1.2.1.(1) that are installed in buildings to which Part 5 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 5].
Exceptions: 
except as stated in Sentence 5.4.1.1.(3), which applies where a lack of resistance to air leakage will not adversely affect health, safety, the intended use of the building or the operation of building services.
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Intent
Intent 1: 
To limit the probability of the inadequate control of:
  • precipitation ingress due to air pressure differences,
  • condensation, or
  • the ingress of airborne moisture from the ground.
This is to limit the probability of deterioration, which could lead to compromised structural integrity of the separators or of elements supported or protected by the separators, which could lead to structural failure, which could lead to harm to persons.
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