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5.3.1.3.(2)
ApplicationIntent
OH1OS2OS1
ObjectiveOH1 Indoor Conditions
Attribution
[F51,F63-OH1.1,OH1.2]
Application
Application 1: 
Materials installed to provide resistance to heat transfer and air movement in, and at interfaces between, building components 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 5.3.1.1.(2), which applies where a lack of resistance to heat transfer 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 wind-washing or short-circuiting, which could lead to the inadequate control of heat transfer through environmental separators under expected environmental loads, which could lead to:
  • excessive heat loss or gain, or
  • condensation.
This is to limit the probability of:
  • the inadequate control of temperatures of interior spaces,
  • 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, and
  • the inadequate thermal comfort of persons.
This is to limit the probability of harm to persons.
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