Intent 1:
To limit the probability of excessive settlement
of, displacement of or incomplete coverage by loose-fill insulation,
which could lead to inadequate thermal resistance, which could lead
to excessively low temperatures of interior surfaces or within assemblies,
or excessively high temperatures of roof surfaces.
This is to limit the probability of:
- condensation,
- the accumulation of moisture, or
- the formation of ice dams, which could lead to water
ingress.
This is to limit the probability of:
- compromised thermal performance of components intended
to provide resistance to heat transfer, which could lead to 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.
Intent 2:
To exempt loose-fill insulation from the application
of Sentence 9.25.2.4.(1), in areas where the risk of excessive
settlement, incomplete coverage and moisture damage is low.