Code of Practice v3.0 Online
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 following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 September 2021.
Summary of Changes in this update:
- In an important update, the recommendation for freeboard for internal gutters on the 5.4.7 Gutter Capacity Calculator was changed to 30mm to align with E1/AS1 and E1/AS2.
- The recommendation for minimum suitable pitch for 9.1 Penetrations Minimum Pitch, has been amended to include modern proprietary profiles.
- New clauses with easy-to-use fastener pattern reference tables. The tables would cover most standard corrugated and trapezoidal cladding, for 3.18 G550 Steel Cladding Fastening Pattern Tables and 3.20 Aluminium Fastening Pattern Tables.
- Other new clauses were for 5.5.4 Intersecting Valleys and 14.8 Double Lapping.
- The drawing in 5.8 Downpipe Spreaders was replaced to give a clearer reflection of the downpipe design and using the online downpipe spreader capacity calculator.
The rest of this update consisted of fixing minor errors.
19.6A Revision Detail - 2021 - September
| Category | Clause Number (at time of update) | Clause (As of current publication) | Details |
|---|---|---|---|
| 2 - Editing and rearrangement | 1 Introduction | Update Revisions Message | |
| 4 - Clause Inserted | 3.18 G550 Steel Cladding Fastening Pattern Tables | New clause aimed at easy reference of fastening patterns. | |
| 4 - Clause Inserted | 3.20 Aluminium Fastening Pattern Tables | New clause for easy referencing of fastening patterns for aluminium cladding. | |
| 1 - Minor Errata | 3.6.2 Roof Traffic | Changed "tradesman" to trades people for gender neutrality. | |
| 1 - Minor Errata | 3.6.3 Uniformly Distributed Load (Wind or Induced Action) | Corrected spelling of "Uniformly. Included a full term before the abbreviation for UDL in the first sentence. | |
| 2 - Editing and rearrangement | 5.4.3 Internal Corners | Clause moved from Valleys to Gutters. | |
| 3 - Substantial change to recommendation | 5.4.7 Gutter Capacity Calculator | The minimum Freeboard on internal gutter calculations has been changed to 30mm to align with E1/AS1 and E1/AS2. | |
| 1 - Minor Errata | 5.5.2 Valley Design | Inserted cross-reference link to Internal Corners. | |
| 4 - Clause Inserted | 5.5.4 Intersecting Valleys | New clause showing the correct way to intersect valleys. | |
| 2 - Editing and rearrangement | 5.8 Downpipe Spreaders | Replaced Downpipe Spreader Design-drawing with a more detailed one. | |
| 3 - Substantial change to recommendation | 9.1 Penetrations Minimum Pitch | Revised first sentence to make allowance for modern profiles and proprietary profiles. | |
| 4 - Clause Inserted | 14.8 Double Lapping | New clause. | |
| 4 - Clause Inserted | 19.6 2021 – September | New Revision clause |