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 December 2020.
Summary of Changes in this update:
We introduced three more responsive tools to aid in roof drainage design. They are:
- 7.1.4 Maximum Run Calculator: Calculating the maximum roof length of any profile, at any pitch, and for any rainfall intensity to achieve effective roof drainage.
- 5.8.1 Maximum Area Above Spreader Calculator: To calculate the maximum allowable area feeding into spreaders.
- 9.4.4 Maximum Area Above Penetration Calculator: To calculate the maximum allowable area above roof penetrations.
The rest of this update consisted of fixing minor errors and improvements for clarity.
19.10A Revision Detail - 2020 - December
| Category | Clause Number (at time of update) | Clause (As of current publication) | Details |
|---|---|---|---|
| 2 - Editing and rearrangement | 1 | 1 Introduction | Update Revisions Message |
| 1 - Minor Errata | 1.3 | 1.3 Standards and Related Documents | Clause renamed. |
| 1 - Minor Errata | 4.10.1 | 4.9.1 Dissimilar Metals | Formatting fix. |
| 1 - Minor Errata | 4.10.3 | 4.9.4 Compatibility Table | Removed reference to Butly Rubber into its own clause 4.9.3 Compatibility with Non-Metallic Substances. |
| 2 - Editing and rearrangement | 4.12 | 4.11 Inert Catchment | Inserted photo "Localised Damage due to Inert Catchment". |
| 1 - Minor Errata | 5.2.4.6 | 5.5.6 Asymmetrical Valleys | Punctuation fix. |
| 2 - Editing and rearrangement | 5.2.5 | 7.1.3 Roof Drainage Capacity | Clause renamed to more accurately reflect its content. |
| 4 - Clause Inserted | 5.4.3 | 5.8.1 Maximum Area Above Spreader Calculator | New online tool for calculating maximum drainage areas for spreaders. |
| 1 - Minor Errata | 5.5 | 5.4.2 Gutter Capacity Design | Grammar fix. |
| 2 - Editing and rearrangement | 5.6.3 | 5.3.2 Rainfall Intensity | Rainfall intensity maps have been added to this clause. Links to rainfall maps have been included in the calculators. |
| 1 - Minor Errata | 5.6.3.2 | 5.3.2.3 Allowance for Short-Term Intensities | Updated short-term intensity multiplication factors. |
| 2 - Editing and rearrangement | 5.7 | 5.4.7 Gutter Capacity Calculator | Renamed the clause. Other capacity calculators have been moved closer to the relevant information dealing with each topic. |
| 0 - Clause Removed | 5.7.1 | North Island 50-year ARI, 10-minute Rainfall Intensity Map | Map moved to 5.3.2 Rainfall Intensity. |
| 0 - Clause Removed | 5.7.2 | South Island 50-year ARI, 10-minute Rainfall Intensity Map | Map moved to 5.3.2 Rainfall Intensity. |
| 3 - Substantial change to recommendation | 7.1.2 | 7.1.2 Runoff | Clause completely revised. |
| 4 - Clause Inserted | 7.1.3 | 7.1.4 Maximum Run Calculator | New online tool to calculate maximum run for drainage of different roofing profiles. |
| 2 - Editing and rearrangement | 8.4.4.4 | 8.4.4.4 Eaves Flashing | Inserted a paragraph recommending eaves flashings in Marine Environments. |
| 1 - Minor Errata | 9.4.2 | 9.4.2 Curb Design | Introductory copy added. |
| 4 - Clause Inserted | 9.4.4 | 9.4.4 Maximum Area Above Penetration Calculator | New online tool for calculating the maximum area above a penetration. |
| 1 - Minor Errata | 17.2.3.1 | 17.2.3.1 Site Testing | Updated the graph. |
| 4 - Clause Inserted | 4.9.3 Compatibility with Non-Metallic Substances | A new clause, previously part of "4.10.3 Compatibility Table". Information was split since this is not part of the table or online tool. | |
| 4 - Clause Inserted | 5.5.7 Valley Capacity Calculator | New clause created for Valley Capacity Calculator. The calculator was previously part of Capacity Calculators. | |
| 4 - Clause Inserted | 5.7.3 Downpipe Capacity Calculator | New clause for Downpipe Capacity Calculators. | |
| 4 - Clause Inserted | 19.10 2020 – December | New clause showing updates effective on 1 December 2020. |