Intent 1:
To limit the probability of:
- an inadequate resistance to water absorption, freeze-thaw
cycling, UV exposure or other deleterious environmental loads, which
could lead to the premature failure of built-up roof membranes, or
- built-up roofs with inadequate tensile strength, which
could lead to splitting and tearing of the membranes under traffic
loads and movement of the building structure.
This is to limit the probability of:
- water penetrating directly to roof decking or sheathing,
or
- compromised thermal performance of components intended
to provide resistance to heat transfer.
This is to limit the probability of:
- an inadequate control of relative humidity, temperatures
of interior spaces or water accumulation,
- the generation of pollutants from biological growth
or from materials that become unstable on wetting, or
- deterioration, which could lead to compromised integrity
of roofs or assemblies protected by roofs.
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.