Intent 1:
To limit the probability of:
- if not enough fasteners were used, the displacement
of shingles under wind-uplift and gravity loads,
- if too many fasteners were used, the splitting of shingles
under loads imposed by the shrinkage of shingles, or
- if fasteners were exposed to water, corrosion, which
could lead to a reduction in the fasteners' ability to resist expected
loads, which could lead to the displacement of shingles.
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.