Intent 1:
To limit the probability of:
- nail head pull-through,
- nail shanks having an inadequate resistance to withdrawal
from their substrate, or
- an inadequate resistance to corrosion on exposure to
water from rain, or melting snow or ice, or to chemicals (introduced
or naturally occurring).
This is to limit the probability of
the displacement of roofing materials and components, which could
lead to:
- precipitation or meltwater ingress, 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.