Intent 1:
To limit the probability of:
- the displacement of shakes under wind and gravity loads,
- the splitting of shakes under loads imposed by the shrinkage
of shakes, or
- the exposure of fasteners to water, which could lead
to corrosion, which could lead to a reduction in the fasteners' ability
to resist expected loads, which could lead to the displacement of
shakes.
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.