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, which could lead to deterioration,
which could lead to the structural failure of exterior walls or elements
protected by exterior walls, which could lead to 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.