Intent 1:
To limit the probability of:
- inadequate coverage of wall, ceiling and floor assemblies
with vapour barrier products, or
- 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
uncontrolled water vapour diffusion into assemblies, which could lead
to:
- 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.