Intent 1:
To limit the probability that the performance of
coatings applied to gypsum board to function as a vapour barrier will
fall significantly below expectations with respect to water vapour
permeance, which could lead to uncontrolled water vapour diffusion
into insulated 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.