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 amount of roof lighting required in a building depends on the building design or use, the external light conditions of the location, and the reflectance of internal surfaces. Regular roof light areas range from 5% of the floor area for warehouses to 10 – 15% for industrial buildings, and 20% for sports halls and factories where intricate work is done.
Proprietary skylights are usually strategically positioned to bring borrowed light into specific areas that are not otherwise naturally lit. Often these are also designed to provide ventilation.