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9.25.1.2.(5)
ApplicationIntent
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Application
Application 1: 
Position of sheet and panel-type materials relative to the thermal insulation, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where:
  • the materials:
    • have an air leakage characteristic less than 0.1 L/(s•m2) at 75 Pa,
    • have a water vapour permeance less than 60 ng/(Pa•s•m2), and
    • are installed in a building assembly that is required to be insulated (see Article 9.25.2.1.),
  • the mild climate indicator determined in accordance with Sentence 9.25.1.2.(6) is less than or equal to 6 300, and
  • the intended use of the interior space:
    • requires the indoor relative humidity to be maintained above 60% 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 60% over the heating season, and the ventilating and air-conditioning system does not have the capacity to reduce the average monthly relative humidity to 60% over that period.
Exceptions: 
except as stated in Sentence 9.25.1.2.(3), which applies to wood-based sheathing materials that conform to Sentence 9.23.16.2.(1) and are not more than 12.5 mm thick.
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Intent
Intent 1: 
To limit the application of Clause 9.25.1.2.(2)(b) and to expand the application of Part 5 to building assemblies that:
  • incorporate low permeance materials other than as cladding or on the warm side of the assembly, and
  • are more susceptible to condensation due to high interior relative humidity over the heating season in milder climates.
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