Intent 1:
To limit the probability that walls, floors and
ceilings will be improperly constructed with regard to heat transfer,
air leakage and condensation control, which could lead to:
- excessively low temperatures of interior surfaces or
within wall, ceiling or floor assemblies, which could lead to condensation,
- excessive air infiltration and exfiltration,
- excessive airborne vapour transfer from interior above
ground and exterior below ground,
- precipitation ingress due to air pressure differences,
- uncontrolled diffusion of water vapour from air in heated
space into insulated wall, ceiling and floor assemblies, which could
lead to condensation,
- inadequate moisture diffusion, venting, or drainage
of moisture to the exterior, 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, or water accumulation,
- pollutant ingress from the exterior, including combustion
products from parking garages, or particulates,
- 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,
- the inadequate thermal comfort of persons, and
- contact with moisture.
This is to limit the probability of harm to persons.