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.
- Single skin.
- 11.3A Double Skin Rooflight
- 11.3D Continuous Vaults.
- 11.3E Individual Domes—Light tubes made from acrylic or polycarbonate are usually manufactured with a flashing suitable to weather most roof cladding profiles.
Proprietary opening window units or skylights made from acrylic also have powder coated frames and are provided with weathering curb flashings, but they should be compatible with the roof cladding and should be installed as required in 9 External Moisture Penetrations.
Acrylic or polycarbonate tubes, skylights or domed roof lights should not drain onto unpainted galvanised roof cladding or onto galvanised fasteners. See 4.12 Inert Catchment.
Proprietary GRP sheets are available that can be used as double skin roof lights. A liner panel GRP or PVC sheet can be used to minimise condensation, but the air gap should be sealed.