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9.25.2.4.(2)
ApplicationIntent
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
[F51-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Maximum supporting slope for loose-fill insulation installed in unconfined sloped spaces, 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 of excessive settlement of, displacement of or incomplete coverage by loose-fill insulation, which could lead to inadequate thermal resistance, which could lead to excessively low temperatures of interior surfaces or within assemblies, or excessively high temperatures of roof surfaces.
This is to limit the probability of:
  • condensation,
  • the accumulation of moisture, or
  • the formation of ice dams, which could lead to water ingress.
This is to limit the probability of:
  • compromised thermal performance of components intended to provide resistance to heat transfer, which could lead to 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 ceilings acting as 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.
Intent 2: 
To exempt loose-fill insulation from the application of Sentence 9.25.2.4.(1), in areas where the risk of excessive settlement, incomplete coverage and moisture damage is low.
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