Intent 1:
To limit the probability of:
- an inadequate protection for roofing membranes carried
over the perimeter cant strip, which could lead to mechanical damage
or exposure to ultraviolet radiation from the sun, which could lead
to membrane failure, or
- water overflowing the flashing and returning under the
edge of the roofing membrane by capillary action or wind pressure.
This is to limit the probability of:
- water accumulating and penetrating exterior walls, 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.