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.