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9.25.2.3.(5)
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Location of insulation around concrete slabs-on-ground, where exterior walls are not supported by footings extending below frost level, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability that insufficient heat will reach the soil around foundations, which could lead to the freezing of soil, which could lead to frost-related soil movement, which could lead to cracking of footings, slabs-on-ground or building envelope assemblies supported by footings or slabs-on-ground.
This is to limit the probability of:
  • condensation,
  • precipitation ingress, or
  • the ingress of moisture from the ground.
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 or protected by 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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