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 addition of an interactive calculator for asymmetrical valleys constitutes the most important inclusion in this update.
The other capacity calculators have all been refined and positioned for improved usability.
19.8A Capacity Calculators
| Gutter Capacity | 5.4.7 Gutter Capacity Calculator |
| Valley Capacity (both symmetrical and asymmetrical) | 5.5.7 Valley Capacity Calculator |
| Downpipe Capacity | 5.7.3 Downpipe Capacity Calculator |
| Maximum Area Above Spreaders | 5.8.1 Maximum Area Above Spreader Calculator |
| Maximum Area Above Penetrations | 9.4.4 Maximum Area Above Penetration Calculator |
| Maximum Run | 7.1.4 Maximum Run Calculator |
In addition, various drawings have been updated for accuracy and correctness.
The rest of this update consisted of fixing minor errors and improvements for clarity.
19.8B Revision Detail - 2021 - March
| 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 | 2.1 | 2.1 Definitions | Added definitions for Translucent, Transparent, Opalescent, and Opaque. |
| 1 - Minor Errata | 3.13 | 3.13 Material Grade | Minor revision for Aluminium. |
| 0 - Clause Removed | 4.8 | Biological Corrosion | Clause removed. 4.8.4 Lichen is now in 4.8 Paint Durability, and 4.10.9 Gutter Leaf Guard is now in 4.10 Other Causes of Corrosion. |
| 2 - Editing and rearrangement | 5.3.7 | 5.5.7 Valley Capacity Calculator | Updated calculator to support Asymmetrical Valley calculations, including dynamic illustration. |
| 2 - Editing and rearrangement | 5.5.2 | 5.8.1 Maximum Area Above Spreader Calculator | Clause edited, new clause (Downpipe Spreaders) introduced with explanatory text about spreaders. Trapezoidal illustration updated to show effective pan-depth area. |
| 2 - Editing and rearrangement | 5.6 | 5.4.2 Gutter Capacity Design | Clause renamed and moved to Types of Gutter. |
| 1 - Minor Errata | 5.6.2 | 5.4.2.3 Gutter Support Systems | Clause moved to Gutter Installation and Maintenance. |
| 2 - Editing and rearrangement | 5.6.3 | 14.18.9 Gutter Installation | Clause renamed and moved to Pre-empting Problems. |
| 2 - Editing and rearrangement | 5.7.1 | 5.8 Downpipe Spreaders | Previously removed clause, now reinstated and updated to align with the new Maximum Area Above Spreader Calculator. |
| 1 - Minor Errata | 5.7.2 | 5.4.2.1 Gutter Fall | Clause moved to Gutter Installation and Maintenance. |
| 2 - Editing and rearrangement | 5.7.5 | 5.7.3 Downpipe Capacity Calculator | Illustration updated to show effective head. |
| 2 - Editing and rearrangement | 5.8 | 5.4.7 Gutter Capacity Calculator | Rectangular Gutter illustration updated to show effective gutter area. Clause renamed to refine search results. |
| 0 - Clause Removed | 6.2 | Acceptable Solution NZBC E2/AS1 | Clause removed as it pertains to E2, which is discussed in NZBC Clause E2 External Moisture (Extract). |
| 2 - Editing and rearrangement | 6.2.1 | 6.2 Compliance | Clause promoted, replacing ES/AS1 at postion 6.2, and content of clause reviewed. |
| 2 - Editing and rearrangement | 7.1.4 | 7.1.4 Maximum Run Calculator | Trapezoidal illustration updated to show effective pan-depth area. |
| 2 - Editing and rearrangement | 7.4 | 7.4 End Laps | Drawing deleted, replaced with a reference to 14.12.1 Sealing End Laps. |
| 2 - Editing and rearrangement | 8.7 | 8.7 Profile Closures | Clause revised. Recommendations have not changed. Drawings replaced with more accurate depictions. |
| 2 - Editing and rearrangement | 9.4.4 | 9.4.4 Maximum Area Above Penetration Calculator | Trapezoidal illustration updated to show effective pan-depth area. |
| 2 - Editing and rearrangement | 14.11.1 | 14.12.1 Sealing End Laps | Drawing replaced with with more accurate depiction of correctly and incorrectly sealed end laps. |
| 1 - Minor Errata | 15.4.4.2 | 15.4.4.2 Substrate | Removed empty link. |
| 4 - Clause Inserted | 19.8 2021 – March | New Revision clause. |