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9.25.2.4.(1)
ApplicationIntent
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
[F51,F63-OH1.1,OH1.2]
Application
Application 1: 
Loose-fill insulation used in assemblies separating heated space from unheated space or the exterior, 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 9.25.2.4.(2), which applies to loose-fill insulation installed in unconfined sloped spaces where the supporting slope is not more than:
    • 4.5 in 12 for mineral fibre or cellulose fibre insulation, and
    • 2.5 in 12 for other types of insulation,
  • Sentence 9.25.2.4.(3), which applies to loose-fill insulation installed in the wood-frame walls of existing buildings,
  • Sentence 9.25.2.4.(4), which applies to blown-in loose-fill insulation installed in above-ground wood-frame walls of new buildings, where
    • the density of the installed insulation is sufficient to preclude settlement,
    • the material is installed behind a membrane that permits visual inspection prior to installation of the interior finish,
    • the material is installed in a manner that will not interfere with the installation of the interior finish, and
    • no water is added to the insulation, unless it can be shown that the added water will not adversely affect other materials in the assembly, and
  • Sentence 9.25.2.4.(5), which applies to water repellent loose-fill insulation installed between the outer and inner wythes of masonry cavity walls.
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Intent
Intent 1: 
To limit the probability of installing loose-fill insulation in assemblies where the material is subject to:
  • excessive settlement or displacement due to gravity and vibration,
  • incomplete coverage, or
  • moisture damage.
This is to limit the probability of compromised thermal resistance, which could lead to excessively low temperatures of interior surfaces or within assemblies.
This is to limit the probability of condensation, 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 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.
Intent 2: 
To facilitate the determination of compliance with this Code where fill levels of loose-fill insulation could be difficult to verify.
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