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9.25.2.2.(1)
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Thermal insulation required to be installed to provide resistance to heat transfer through walls, ceilings, roofs and floors separating heated space from unheated space, the exterior air or the exterior soil, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except as stated in Sentence 9.25.2.2.(2), which applies to flame-spread properties.
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Intent
Intent 1: 
To limit the probability that the thermal performance of required thermal insulation will fall significantly below expectations, which could lead to an inability to control heat transfer through assemblies, which could lead to:
  • excessively low temperatures of interior surfaces or within assemblies, or
  • condensation.
This is to limit the probability of:
  • an inadequate control of the temperature of interior spaces or relative humidity,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to compromised integrity of assemblies acting as 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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