Intent 1:
To limit the probability that cladding, which is
made of a material with a high coefficient of thermal expansion, will
be restrained from expanding and contracting within the expected range
of service temperatures, which could lead to:
- buckling of cladding,
- tearing of cladding at fastener locations, or
- deformation, loosening or pullout of fasteners.
This is to limit the probability of
the displacement of cladding, trim and flashing, opening of joints
or failure of caulking, 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 temperatures of interior spaces
or relative humidity,
- the generation of pollutants from biological growth
or from materials that become unstable on wetting,
- deterioration, which could lead to compromised integrity
of exterior walls or elements protected by exterior walls, 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.