Sentence 9.25.4.3.(2)

  1. OH1
  2. OS2

Objective

OH1 Indoor Conditions

Attribution

Intent

Intent 1:

To limit the probability that, where separate products are used for the vapour barrier and insulation, the location of the vapour barriers in the assembly is at a plane in the building envelope where the temperature is sufficiently low to cause the condensation of water vapour from interior spaces on interior surfaces or within assemblies.

This is to limit the probability of:

  • condensation, or
  • compromised thermal performance of components intended to provide resistance to heat transfer.

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 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.

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