The NZ Metal Roof and Wall Cladding Code of Practice is a comprehensive design & installation guide, and a recognised related document for Acceptable Solution E2/AS1 of the NZ Building Code.
Fastener design aims to avoid strength failure of the screw before failure of the sheeting or the structure. Most fastener failures happen due to negative load (or uplift) and testing procedures are designed to closely simulate these conditions.
Fasteners used to fix metal cladding can fail by pulling out of the structure or by shearing. The cladding can fail by pull-over or profile collapse.
Fastener design should be sufficient to avoid pull-out and prevent deformation of the cladding around the fastener heads that can cause leaks.