Intent 1:
To limit the probability of sagging and misalignment
or opening of joints, which could lead to:
- an inadequate delivery of warm air or return of cold
air, or
- inadequate ventilation.
This is to limit the probability of:
- an inability to maintain the minimum indoor air temperatures
[see Sentence 9.33.3.1.(1)], which could lead to condensation,
or
- inadequate combustion air for fuel-burning appliances.
This is to limit the probability of:
- the inadequate control of temperatures, airborne pollutants
or relative humidity,
- the generation of pollutants from biological growth
or from materials that become unstable on wetting,
- the deterioration of building elements, or
- incomplete combustion.
This is to limit the probability of:
- negative effects on the air quality of indoor spaces,
or
- the inadequate thermal comfort of persons.
This is to limit the probability of harm to persons.