Intent 1:
For minimum slope requirements, to limit the probability
of an insufficient slope of the roof or construction that serves as
a roof, which could lead to inadequate drainage or water pooling,
which could lead to:
- water accumulation, which could lead to damage to roofing
material, which could lead to the deterioration of roofing, or
- water ingress at roofing joints.
This is to limit the probability of
the premature failure of roofing, which could lead to precipitation
or meltwater 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,
- deterioration, which could lead to compromised integrity
of roofs or assemblies protected by roofs, or
- water accumulation in interior spaces.
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 supersede the application of Sentence 9.26.3.1.(1) to allow lower slopes where roofing material specifically
designed for lower slopes will be used.