Five families in this takeoff. Appearance is last. Cover, min cladding pitch, and check-run come first. Broader notes: NZ longrun profiles.
| Profile | Cover (library) | Min pitch | Check run | Typical job |
|---|---|---|---|---|
| Dimond / Metalcraft / Stratco corrugate | 762 / 760 / 760 mm | 8° | 15 m | Default Kiwi gable. Not 6°. Dimond vs Metalcraft. |
| Dimond Six Rib | 760 mm (820 overall) | 4° | 20 m | Step down when corrugate fails pitch. |
| Dimond Hi Five | 765 mm (confirm 755) | 3° | 40 m | Deeper five-rib; South Island supply listed. Hi Five. |
| Metalcraft T-Rib | 760 mm | 3° | 40 m | Same CoP row as Hi Five; different roll. |
| Tray / secret-fix | 300 mm placeholder | 3° | 60 m | Override pan width. Tray pitch. |
10.8 m ÷ 0.760 m = 14.21 → 15 sheets per plane. Using 820 mm overall under-orders.
Where each one fails
- Corrugate on a 6° garage: stop. Trapezoidal or tray, or re-pitch. Min pitch.
- Six Rib on a 22 m run at 4°: drainage check, not a silent pass.
- Hi Five specified in Auckland without written supply: availability, then 765 vs 755 mm cover.
- T-Rib + Hi Five mixed on one roof: two covers, two flashings.
- Tray counted at 300 mm when the coil is 450 mm: ~50% extra sheets.
Purlin span and fixing tables are not in this calculator. Open the trapezoidal or corrugate page with the named profile, then the product sheet and NZMRM CoP.