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 term “gutters” can be applied to all roof drains, but “spouting” refers specifically to external gutters.
Types of gutter:
- External gutters – positioned outside the building envelope.
- Concealed Fascia-Gutter Systems – gutters installed directly behind a fascia.
- Internal Gutters – formed inside a parapet wall or where two connected gables meet at an internal draining point.
- Valleys – where two roof planes meet at an angle of less than 180°.
- Roof Gutters – where a penetration obstructs and concentrates the flow of water, often into a single pan.
- Secret Gutters – where a roof discharges into a raked barge.
The definition of gutters in the COP includes the troughs of a profile adjacent to an obstruction (such as a penetration) or where a secret gutter is required, i.e., at the barge line of a swiss gable roof.