Intent 1:
To limit the probability of:
- restricted air flow through the vented space, or
- excessive air flow through the insulation, which could
lead to reduced thermal resistance.
This is to limit the probability of:
- condensation,
- the accumulation of moisture, or
- the formation of ice dams on sloped roofs.
This is to limit the probability of:
- the ingress of water, 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 ceilings 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.