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5.3.1.3.(3)
ApplicationIntent
OH1OS2OS1
ObjectiveOH1 Indoor Conditions
Attribution
[F51,F63-OH1.1,OH1.2] [F41-OH1.1]
Application
Application 1: 
Spray-in-place polyurethane insulation installed to provide resistance to heat transfer in building components and assemblies as well as at interfaces between components and 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 5.3.1.1.(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 that the performance of the installed material, with respect to chemical stability or thermal performance, will fall significantly below expectations, which could lead to:
  • the inadequate control of heat transfer, or
  • the emission of gases from improperly constituted or applied material.
This is to limit the probability of:
  • 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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