To limit the probability of fastening cladding to an inappropriate substrate.
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), this is to limit the probability of an inadequate resistance to lateral loads, which could lead to racking of exterior walls, which could lead to:
Where exterior walls support floors, this is to limit the probability of the deflection or vibration of such floors, which could lead to negative effects on the psychological well-being of persons.