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5.4.1.2.(3)
OH1OS2OS1
ObjectiveOH1 Indoor Conditions
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:
  • total heat loss or gain due to air mass transfer,
  • air infiltration and exfiltration,
  • airborne vapour transfer from the interior above ground and from the exterior below ground,
  • precipitation ingress due to air pressure differences, or
  • condensation.
This is to limit the probability of:
  • 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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