The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 September 2023.
Versioning and presentation:
- Beginning with this revision the Code of Practice updates its version number with each update, to make it clear when the current update was published.
The version numbering uses a year.month pattern: for example this update is v23.09, where 23 indicates the year (2023) and 09 indicates the month (September).
Refer to 19 Revision History for a log of specific changes in each update. - An overall upgrade to styling for improved typeface readability and better contrast in headings.
- Additionally there are new "Quick Actions" on the COP Home page for reference to updates and interactive tools, and the registration process has been streamlined.
Substantial change to recommendations:
- 16 Maintenance and all its sub-clauses have been comprehensively revised.
- 5.6.2 Sumps: Added recommendation to seal internal sumps against the sides and soles of the gutter.
- 14.19.3 Correctly Installed Gutters: Changed recommendation for gutter drainage to be more consistent with MBIE tolerances.
- In 3 Structure, tables and graphs have been rearranged to correspond to whether the design is under NZS3604 or AS/NZS1170:
3.10 Fastening Pattern Tables – Designs to NZS 3604
3.11 Wind Load/Span Graphs – Designs to AS/NZS1170
Editing and rearrangement:
- 8.5.5 Apron Flashings: Corrected name for chase and face fastened flashing to Reglet flashings. Added definition to the Glossary.
- 9.4.2.6 Penetration Flashings on Trapezoidal Profiles: Clarified recommendations for trapezoidal sheet cover above the flashing when using under-soaker flashings.
- Revised the Introduction to 3 Structure to make it easier for users to find the correct fastening pattern for NZS3604 or Wind Load/Span Graphs for SED (AS/NZS 1170) designs.
- 3.9 Fastener Requirements and Overhangs: renamed the clause.
- 4.9.4 Compatibility Table: Correction to use caution for contact between concrete and steel.
- Revised 8.2A Notched Flashing illustration to recommend a screw fastener to the purlin in preference to a rivet.
- 7.3.2B Unfavourable Circumstances for Controlling Expansion: inserted vertical axis label: sheet length (m). Removed Pan Fixing as unfavourable condition for expansion control.
- 15.4.9 Standing Seam Roofing Wind Loads: Renamed table — Generic Standing Seam Clip Spacing.
- 12.2 Purlin Creasing: Copy editing for clarity.
- 8.2.1 Flashing Edges: Removed recommendation to provide longitudinal flashings with an anti-capillary gap, as this is impractical.
The rest of the updates consisted of minor corrections and edits.
19.5A Revision Detail - 2023 - September
Category | Clause Number (prior to update) | Clause (As of current publication) | Details |
---|---|---|---|
2 - Editing and rearrangement | 1 | 1 Introduction | Updated Revisions Message |
2 - Editing and rearrangement | 1.1 | 1.1 Disclaimer and Copyright | Removed copy explaining the update-policy and created a new subclause for those explanations. |
4 - Clause Inserted | 1.1.1 Code of Practice Update-Policy | Outline the update policy, new Version numbering scheme, and process for requesting archival content | |
2 - Editing and rearrangement | 2.1 | 2.1 Definitions | Added definition for Reglet flashing. |
4 - Clause Inserted | 3.11 Wind Load/Span Graphs – Designs to AS/NZS1170 | New clause to group 3.11.1 Steel Cladding Wind Load Span Graphs and 3.11.2 Aluminium Cladding Wind Load Span Graphs for designs to AS/NZS 1170. | |
2 - Editing and rearrangement | 3 | 3 Structure | Revision of the introductory clause to clarify uses of 3.10 Fastening Pattern Tables – Designs to NZS 3604 and3.11 Wind Load/Span Graphs – Designs to AS/NZS1170. |
1 - Minor Errata | 3.2.1 | 3.2.1 AS/AZS 1170.2:2011 | Fixed typo: amendments. Completed the last sentence and formatted the link to 3.7 Modes of Failure properly. |
1 - Minor Errata | 3.6.2.1 | 3.6.2.1 Wind Load | Resized photographs so they display the same. |
1 - Minor Errata | 3.6.2.2 | 3.6.2.2 Snow Loads | Grammatical fix for clarity. |
1 - Minor Errata | 3.7.2 | 3.7.2 Deflection | Fixed typo: distributed and roofing. |
2 - Editing and rearrangement | 3.9 | 3.9 Fastener Requirements and Overhangs | Clause has been renamed. |
4 - Clause Inserted | 3.10 Fastening Pattern Tables – Designs to NZS 3604 | New clause to group 3.10.1 G550 Steel Roof Fastening Pattern Tables and 3.10.3 Aluminium Fastening Pattern Tables for NZS3604-designs. | |
3 - Substantial change to recommendation | 4.9.4 | 4.9.4 Compatibility Table | Correction to "use with caution" for contact between concrete and steel. Removed brand names in favour of generic descriptive terms. |
4 - Clause Inserted | 4.15.1 | 4.15.1 Ground Clearance | New clause under 4.15 Clearances. |
3 - Substantial change to recommendation | 5.5.7 | 5.5.7 Valley Capacity Calculator | Enabled valley calculations for roofs at pitches below 3° - enforces a minimum freeboard of 30mm |
3 - Substantial change to recommendation | 5.6.2 | 5.6.2 Sumps | Added recommendation for internal sumps to be sealed against the sides and sole of the gutter. Some typo fixes. |
1 - Minor Errata | 6.2 | 6.2 Compliance | Fixed a missing link to: 7 External Moisture Roofing, 8 External Moisture Flashings, and 9 External Moisture Penetrations. |
2 - Editing and rearrangement | 8.2 | 8.2 Flashing Design | Revised 8.2A Notched Flashing illustration to recommend a screw fastener to the purlin in preference to a rivet. |
2 - Editing and rearrangement | 8.2.1 | 8.2.1 Flashing Edges | Removed recommendation to provide longitudinal flashings with an anti-capillary gap, as this is impractical. |
4 - Clause Inserted | 8.3 Metal Fascias and Facades | A new clause providing guidance for purpose-made Metal Fascias and Facades. | |
2 - Editing and rearrangement | 8.4.4 | 8.5.5 Apron Flashings | Corrected name for 8.5.5H Parapet — Reglet Flashing, Chase Cut and 8.5.5I Parapet — Reglet Flashing, Face Fixed. |
2 - Editing and rearrangement | 9.4.2.6 | 9.4.2.6 Penetration Flashings on Trapezoidal Profiles | Clarifying text for fixing under-soaker flashing added to 9.4.2.6B Level Under-Soaker: Trapezoidal, |
1 - Minor Errata | 12 | 12 Fitness For Purpose | Fixed typo: Addition |
1 - Minor Errata | 13.3 | 13.3 Working on Roofs | Edited the caption under 13.3A Working on Roofs Safety Systems. |
1 - Minor Errata | 14.3 | 14.3 Accepting Delivery | Added clarifying statement to contact the supplier when the condition of the product is in doubt. |
1 - Minor Errata | 14.13.1 | 14.13.1 Nails | Photo of Nail Pull-Out rotated. |
3 - Substantial change to recommendation | 14.19.3 | 14.19.3 Correctly Installed Gutters | Changed recommendation for gutter drainage to be more consistent with MBIE tolerances. |
1 - Minor Errata | 15.1.1 | 15.1.7 Spring Curving | Updated reference to the tables in this clause. |
1 - Minor Errata | 15.1.6 | 15.1.6 Concave Roofs | Removed reference to a redundant table. Some grammar fixes. |
1 - Minor Errata | 15.1.9 | 15.1.11 Crimp Curving | Fixed a broken link to 16.8 Overpainting. |
2 - Editing and rearrangement | 15.4.8 | 15.4.9 Standing Seam Roofing Wind Loads | Renamed table, it is now called: Generic Standing Seam Clip Spacing and inserted Medium Wind Zone. |
1 - Minor Errata | 15.4.12.4 | 15.4.13.4 Finishing at Ridges and Eaves of Tray Roofing | Typo fix. |
1 - Minor Errata | 16 | 16 Maintenance | Some editing for accuracy. |
4 - Clause Inserted | 16.1 Maintenance Compliance | New clause inserted. | |
0 - Clause Removed | 16.1 | Improved Durability | Clause removed during the over-all revision of 16 Maintenance . |
0 - Clause Removed | 16.2 | Normal Maintenance | This clause was removed during the over-all revision of 16 Maintenance |
4 - Clause Inserted | 16.3 Reactive Maintenance | New clause created during the over-all revision of 16 Maintenance . | |
3 - Substantial change to recommendation | 16.3 | 16.4 Scheduled Maintenance | The clause was revised as part of the overall revision of 16 Maintenance . |
3 - Substantial change to recommendation | 16.4 | 16.5 Preventative Maintenance | This clause was revised during the overall revision of 16 Maintenance . |
3 - Substantial change to recommendation | 16.5 | 16.6 Special Maintenance | This clause was revised during the overall revision of 16 Maintenance . |
3 - Substantial change to recommendation | 16.6 | 16.2 Inspection | Clause revised as part of the over-all revision of 16 Maintenance . |
3 - Substantial change to recommendation | 16.7 | 16.7 Washing | This clause was revised during the overall revision of 16 Maintenance . |
3 - Substantial change to recommendation | 16.7.1 | 16.7.1 Lichen And Mould | THis clause was revised during the overall revision of 16 Maintenance . |
2 - Editing and rearrangement | 16.7.2 | 16.7.2 Graffiti | This clause was revised during the overall revision of 16 Maintenance . |
3 - Substantial change to recommendation | 16.8 | 16.8 Overpainting | This clause was revised during the overall revsion of 16 Maintenance . |
4 - Clause Inserted | 16.8.1 Preparation for Overpainting | New clause created during the overall revision of 16.8 Overpainting. | |
3 - Substantial change to recommendation | 16.8.1 | 16.8.3 Unpainted Cladding | This clause has been revised during the overall revision of 16 Maintenance . |
2 - Editing and rearrangement | 16.8.2 | 16.8.4 Weathered Pre-Painted Cladding | This clause was revised during the overall revision of 16 Maintenance . |
2 - Editing and rearrangement | 16.8.3 | 16.8.1.1 White Corrosion | This clause has been revised during the overall revision of 16 Maintenance . |
2 - Editing and rearrangement | 16.8.4 | 16.8.1.2 Red Corrosion | This clause was revised during the overall revision of 16 Maintenance . |
4 - Clause Inserted | 16.8.5 Unweathered Pre-Painted Cladding | New clause created during the overall revision of 16 Maintenance . | |
3 - Substantial change to recommendation | 16.8.5 | 16.8.2 Application | This clause has been renamed and completely revised during the overall revision of 16 Maintenance , previously independent clauses have also been incorporated. They are: Brush Application, Roller Application, Spray Application |
0 - Clause Removed | 16.8.6 | Brush Application | This clause has been removed during the overall revison of 16 Maintenance . Brush Application is now discussed in 16.8.2 Application. |
0 - Clause Removed | 16.8.7 | Roller Application | This clause has been removed during the overall revison of 16 Maintenance . Roller Application is now discussed in 16.8.2 Application. |
0 - Clause Removed | 16.8.8 | Spray Application | This clause has been removed during the overall revison of 16 Maintenance . Spray Application is now discussed in 16.8.2 Application. |
0 - Clause Removed | 16.9 | Material Selection | This clause was removed during an overall revision of 16 Maintenance . |
0 - Clause Removed | 16.9.1 | Residential | This clause was removed during an overall revision of 16 Maintenance . |
0 - Clause Removed | 16.9.2 | Commercial | This clause was removed during an overall revision of 16 Maintenance . |
0 - Clause Removed | 16.9.3 | Responsibility and Liability | This clause was removed during an overall revision of 16 Maintenance . |
0 - Clause Removed | 16.9.4 | Special Environments And Exclusions | This clause was removed during an overall revision of 16 Maintenance . |
0 - Clause Removed | 16.11 | Storage | This clause was removed during an overall revision of 16 Maintenance . Storage is dealt with through various clauses under 14 Installation. |
2 - Editing and rearrangement | 18.2 | 18.2 Pitch & Rise Calculator | Renamed from "Roof Pitch Tangent" to "Pitch & Rise Calculator" for clarity. |
2 - Editing and rearrangement | 18.5 | 18.5 Geometry And Measurement | Renamed from "Geometry And Mensuration" to "Geometry And Measurement". |
4 - Clause Inserted | 19.5 2023 – September | New clause listing revisions for September 2023. |