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.
Edging material must be compatible with the flashing and cladding material.
Edging material must have the same durability as the cladding material
Edging must be able to be dressed to within 3 mm of the pan of all profiles, and 5 mm to the cornder of trapezoidal profiles
Soft edging must remain in position in wind loads up of to 65 m/s.
Metallic soft edge may be backed by an inert layer of other material to improve striffness and shape retention. Perforated metallic soft edging without a back is also acceptable.