2023 – March
The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 March 2023.
Substantial changes to recommendations:
- Gutter capacity calculator extended to include secret gutters, and gutter fall greater than 1:100.
- New clause Roof Drainage Terminology as used in the COP.
- Opinion on small sheds and bay windows that do not require spouting.
- Reviewed table Minimum Roof Cladding Pitch and added maximum run.
- Added design advice for scuppers in Internal Gutter Design Features
- Added advice for minimising roof noise in Standing Seam Roofing Wind Loads.
Editing and rearrangement:
- Freeboard for Internal Gutters has been increased to 30mm to align with COP calculator and E1/AS1
- Minimum Overhang updated drawing. No change to recommendations.
- Turndowns (Drip Forming or Drip Edging) reviewed copy to provide guidance for difficult-to-turn-down profiles, such as deep corrugated profiles.
- Glossary added definitions for freeboard, internal gutters, hidden gutters, secret gutters, and raked spouting.
- Updated illustrations detailing
Stepped Fascia Corrugate Over Barge, Stepped Fascia Corrugate Under Barge,Stepped Fascia Trapezoidal Over Barge, Stepped Fascia Trapezoidal Under Barge, Parapet Flashing – Chase Cut, Parapet Flashing, Face Fixed, Tray Roofing-Wall Connection and Valley Baffle.
Other changes consisted of small fixes for clarity and grammar.
Revision Detail - 2023 - March
| Category | Clause Number (at time of update) | Clause (As of current publication) | Details |
|---|---|---|---|
| 3 - Substantial change to recommendation | 5.3.7 | Gutter Capacity Calculator | Gutter Capacity Calculator now supports calculation where gutter fall is greater than 1:100, and has an option for Secret Gutters (i.e. where a roof slopes towards a raking wall or barge). |
| 3 - Substantial change to recommendation | 7.1.1 | Minimum Roof Cladding Pitch | Revised and renamed table Minimum Recommended Pitch. |
| 4 - Clause Inserted | Roof Drainage Terminology | New clause to clarify COP usage of terminology pertaining to Roof Drainage. | |
| 4 - Clause Inserted | Designing for Climate Change | Newly introduced clause, recommending NIWA's HIRDS-tool. | |
| 4 - Clause Inserted | Bay Windows | New clause discussing drainage for Bay Windows. | |
| 4 - Clause Inserted | Outbuildings | New clause to give guidance on roof drainage for outbuildings. | |
| 2 - Editing and rearrangement | 1 | Introduction | Updated Revisions Message |
| 2 - Editing and rearrangement | 2.1 | Definitions | Added definitions for Freeboard, Internal gutter, Hidden gutter, Secret gutter, and Raking Spouting. |
| 1 - Minor Errata | 3.5.2 | Wind Load | Fixed broken link. |
| 2 - Editing and rearrangement | 5.3.5.1 | Internal Gutter Design Features | Added clarifying text regarding scuppers. |
| 2 - Editing and rearrangement | 5.4.6 | Asymmetrical Valleys | Included details drawing for installing a . |
| 2 - Editing and rearrangement | 8.3 | Flashing Cover | Added clarification of rib cover to Apron Flashing Cover — Trapezoidal. |
| 2 - Editing and rearrangement | 8.4.2 | Barge And Verge | Added illustrations showing details for:Stepped Fascia Corrugate Under Barge; Stepped Fascia Corrugate Over Barge; Stepped Fascia Trapezoidal Under Barge; Stepped Fascia Trapezoidal Over Barge; and Tray Roofing-Wall Connection. |
| 2 - Editing and rearrangement | 8.4.4 | Apron Flashings | Added illustration showing Parapet Flashing – Chase Cut and Parapet Flashing, Face Fixed. |
| 1 - Minor Errata | 14.16 | Stop-ends | Minor edit for clarity. |
| 2 - Editing and rearrangement | 14.17 | Turndowns (Drip Forming or Drip Edging) | Edited copy to provide guidance for difficult to turn down profiles, such as deep corrugated profiles. |
| 4 - Clause Inserted | 2023 – March | Revision and updates active 1 March 2023. |
(optional caption)
Clause:
019_005_000_000_000_000_000_000_000
Clause Number:
19.5
/cop/revision-history/2023-march
Revision Category:
4 - Clause Inserted
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