- Battens
- Timber strips the roofing is fixed to (common under tiles).
- Purlins
- Roof framing members that profiled metal is usually fixed to; part of the primary structure 1.
- Underlay
- A membrane under the roofing that manages any moisture getting past the roof.
- Flashings
- Formed metal pieces that weatherproof junctions, edges and penetrations.
- Ridge cap
- The flashing along the top of the roof.
- Profile
- The shape of a metal sheet, e.g. corrugate, trapezoidal, tray.
- Exposure category
- Manufacturer classification from Mild to Extremely Severe based on salt exposure 2.
- Wind zone
- NZS 3604 site classification from Low to Extra High 3.
- LBP
- Licensed Building Practitioner. Roofing is a licence class 4.
- Restricted building work
- Consented residential work on structure or weathertightness that must be done or supervised by an LBP 1.
- Record of Building Work
- A record an LBP provides after restricted building work 5.
- Schedule 1
- Part of the Building Act listing work that doesn't need consent 6.
- Decramastic
- A pressed-metal tile with a stone-chip coating; some older ones may contain asbestos 7.
- Friable / non-friable asbestos
- Friable crumbles easily and needs a Class A removalist; non-friable over 10 m² needs Class B or A 8.
Sources
- MBIE Building Performance — Restricted building work
- COLORSTEEL® — Environmental categories & warranty guide (PDF)
- MBIE — E2 External Moisture Acceptable Solution, amendment 5 (wind zone speeds)
- LBP — Licensing classes
- MBIE Building Performance — Carrying out restricted building work
- MBIE Building Performance — Schedule 1, exemption 1: general repair, maintenance and replacement
- PropertyHelp — How much does asbestos removal cost in NZ? (2026 price guide, Sept 2026)
- WorkSafe — Non-friable asbestos removal: safe work practices
Figures are published planning ranges, checked 26 October 2026. They are not quotes.