Intent 1:
To limit the probability that roof sheathing will
not be installed under valley flashing, which could lead to insufficient
support of the flashing, which could lead to excessive deflection
or failure of the roofing.
This is to limit the
probability of precipitation or meltwater ingress, which could lead
to:
- compromised thermal performance of components intended
to resist heat transfer, which could lead to an inadequate control
of the temperature of interior spaces,
- the generation of pollutants from biological growth
or from materials that become unstable on wetting,
- deterioration, which could lead to compromised integrity
of environmental separators, 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.