Intent 1:
To limit the probability of:
- performance that falls significantly below expectations,
which could lead to an inability to resist expected mechanical, impact
and environmental loads, which could lead to deformation or premature
failure, or
- where panel-type siding is installed as bracing to satisfy Subclause 9.23.13.1.(2)(a)(i) and Clause 9.23.13.6.(1)(a), insufficient
material strength, which could lead to an inability to resist lateral
loads, which could lead to buckling, which could lead to racking of
exterior walls.
This is to limit the probability of:
- 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.
Intent 2:
To supersede the thickness requirement stated in
the first part of the Sentence and allow a reduced thickness in cases
where extra support is provided.