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9.25.4.2.(2)
ApplicationIntent
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Application
Application 1: 
Vapour barriers in thermally insulated wall, ceiling and floor assemblies separating heated space from unheated space, exterior air or soil, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where:
  • the mild climate indicator determined in accordance with Sentence 9.25.1.2.(6) is greater than 6 300, and
  • the intended use of the interior space:
    • requires the indoor relative humidity to be maintained above 35% over the heating season, and the ventilating and air-conditioning system is designed to maintain that relative humidity, or
    • will result in an average monthly indoor relative humidity above 35% over the heating season, and the ventilating and air-conditioning system does not have the capacity to reduce the average monthly relative humidity to 35% or less over that period.
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Intent
Intent 1: 
To limit the application of Sentence 9.25.4.2.(1).
Intent 2: 
To expand the application of Part 5 to building assemblies that are more susceptible to condensation due to colder exterior temperatures over the heating season or an extended heating season.
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