Back9.25.4.3.(2)

ATTRIBUTION:

Functional Statement:

F63

To limit moisture condensation.

Objective:

OH1.1, OH1.2

 

APPLICATION:

Location of vapour barriers in thermally insulated wall, ceiling and floor assemblies separating heated space from unheated space, exterior air or exterior soil, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

INTENT:

To limit the probability of vapour barrier installation 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.

ATTRIBUTION:

Functional Statement:

F63

To limit moisture condensation.

Objective:

OS2.3

 

APPLICATION:

Location of vapour barriers in thermally insulated wall, ceiling and floor assemblies separating heated space from unheated space, exterior air or exterior soil, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

INTENT:

To limit the probability of vapour barrier installation 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 condensation, which could lead to deterioration, which could lead to compromised structural integrity of assemblies acting as environmental separators, which could lead to harm to persons.