Sentence 9.27.5.6.(1)

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

This is to limit the probability of harm to persons.