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5.4.1.1.(1)
ApplicationIntent
OH1OS2OS3OS1
ObjectiveOH1 Indoor Conditions
Attribution
(a),(b),(e) [F51,F52,F54,F55-OH1.2]
(a),(b),(c) [F40,F55-OH1.1]
(c) [F55,F61,F63-OH1.3]
Application
Application 1: 
Properties and position of materials and components installed to control air leakage and permit venting to the exterior as part of an air barrier system.
This applies to building materials, components, assemblies and their interfaces 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].
Application 2: 
This also applies to the position of low air and vapour permeance materials within the building assembly relative to the position of materials providing thermal resistance in the assemblies of buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where the building assembly:
  • incorporates low permeance materials that act as other than cladding or that are installed on the warm side of the assembly, and
  • is more susceptible to condensation [see Sentences 9.25.1.2.(4) and (5) for combinations of interior and exterior environmental conditions that create a higher risk for condensation].
Exceptions: 
except as stated in Sentence 5.4.1.1.(3), which applies where an inadequate control of air leakage or inadequate venting to the exterior 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 air leakage or inadequate venting, which could lead to:
  • the inadequate control of temperatures of interior spaces, drafts, relative humidity, or water accumulation,
  • pollutant ingress, including soil gas, combustion products from parking garages, and particulates,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to compromised integrity of environmental separators.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces,
  • the inadequate thermal comfort of persons, and
  • contact with moisture.
This is to limit the probability of harm to persons.
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