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.
The science of internal moisture control is concerned with the need to manage and control condensation.
The condition of the outside environment, the building design, and occupant behaviour affect humidity in the living spaces, which ultimately affects humidity in the ceiling space.
This section of the COP focusses predominantly on managing humidity in the ceiling space of dwellings.
Shorter sections also cover the design of wall cladding. Non-residential roof and wall cladding may be affected by the need to control internal moisture.