2023 – September
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 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:
- Maintenance and all its sub-clauses have been comprehensively revised.
- Sumps: Added recommendation to seal internal sumps against the sides and soles of the gutter.
- Correctly Installed Gutter: Changed recommendation for gutter drainage to be more consistent with MBIE tolerances.
- In Structure, tables and graphs have been rearranged to correspond to whether the design is under NZS3604 or AS/NZS1170:
Fastening Pattern Tables – Designs to NZS 3604
Wind Load/Span Graphs – Designs to AS/NZS1170
Editing and rearrangement:
- Apron Flashings: Corrected name for chase and face fastened flashing to Reglet flashings. Added definition to the Glossary.
- Sheetmetal Flashings on Trapezoidal Profiles: Clarified recommendations for trapezoidal sheet cover above the flashing when using under-soaker flashings.
- Revised the Introduction to 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.
- Maximum Span and Fastener Requirements: renamed the clause.
- Compatibility Table: Correction to use caution for contact between concrete and steel.
- Revised Notched Flashing illustration to recommend a screw fastener to the purlin in preference to a rivet.
- Unfavourable Circumstances for Controlling Expansion: inserted vertical axis label: sheet length (m). Removed Pan Fixing as unfavourable condition for expansion control.
- Standing Seam Roofing Wind Loads: Renamed table — Generic Standing Seam Clip Spacing.
- Purlin Creasing: Copy editing for clarity.
- 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.
Revision Detail - 2023 - September
| Category | Clause Number (prior to update) | Clause (As of current publication) | Details |
|---|---|---|---|
| 2 - Editing and rearrangement | 1 | Introduction | Updated Revisions Message |
| 2 - Editing and rearrangement | 1.1 | Disclaimer and Copyright | Removed copy explaining the update-policy and created a new subclause for those explanations. |
| 4 - Clause Inserted | 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 | Definitions | Added definition for Reglet flashing. |
| 4 - Clause Inserted | Wind Load/Span Graphs – Designs to AS/NZS1170 | New clause to group Steel Cladding Wind Load Span Graphs and Aluminium Cladding Wind Load Span Graphs for designs to AS/NZS 1170. | |
| 2 - Editing and rearrangement | 3 | Structure | Revision of the introductory clause to clarify uses of Fastening Pattern Tables – Designs to NZS 3604 and Wind Load/Span Graphs – Designs to AS/NZS1170. |
| 1 - Minor Errata | 3.2.1 | AS/AZS 1170.2:2011 | Fixed typo: amendments. Completed the last sentence and formatted the link to Modes of Failure properly. |
| 1 - Minor Errata | 3.6.2.1 | Wind Load | Resized photographs so they display the same. |
| 1 - Minor Errata | 3.6.2.2 | Snow Loads | Grammatical fix for clarity. |
| 1 - Minor Errata | 3.7.2 | Deflection | Fixed typo: distributed and roofing. |
| 2 - Editing and rearrangement | 3.9 | Fastener Requirements and Overhangs | Clause has been renamed. |
| 4 - Clause Inserted | Fastening Pattern Tables – Designs to NZS 3604 | New clause to group G550 Steel Cladding Fastening Pattern Tables and Aluminium Fastening Pattern Tables for NZS3604-designs. | |
| 3 - Substantial change to recommendation | 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 | Ground Clearance | New clause under Clearances. |
| 3 - Substantial change to recommendation | 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 | 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 | Compliance | Fixed a missing link to: External Moisture Roofing, External Moisture Flashings, and External Moisture Penetrations. |
| 2 - Editing and rearrangement | 8.2 | Flashing Design | Revised Notched Flashing illustration to recommend a screw fastener to the purlin in preference to a rivet. |
| 2 - Editing and rearrangement | 8.2.1 | Flashing Edges | Removed recommendation to provide longitudinal flashings with an anti-capillary gap, as this is impractical. |
| 4 - Clause Inserted | Metal Fascias and Facades | A new clause providing guidance for purpose-made Metal Fascias and Facades. | |
| 2 - Editing and rearrangement | 8.4.4 | Apron Flashings | Corrected name for Parapet Flashing, Chase Cut and Parapet Flashing, Face Fixed. |
| 2 - Editing and rearrangement | 9.4.2.6 | Sheetmetal Flashings on Trapezoidal Profiles | Clarifying text for fixing under-soaker flashing added to Level Under-Soaker: Trapezoidal, |
| 1 - Minor Errata | 12 | Fitness For Purpose | Fixed typo: Addition |
| 1 - Minor Errata | 13.3 | Working on Roofs | Edited the caption under Working on Roofs Safety Systems. |
| 1 - Minor Errata | 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 | Nails | Photo of Nail Pull-Out rotated. |
| 3 - Substantial change to recommendation | 14.19.3 | Correctly Installed Gutters | Changed recommendation for gutter drainage to be more consistent with MBIE tolerances. |
| 1 - Minor Errata | 15.1.1 | Spring Curving | Updated reference to the tables in this clause. |
| 1 - Minor Errata | 15.1.6 | Concave Roofs | Removed reference to a redundant table. Some grammar fixes. |
| 1 - Minor Errata | 15.1.9 | Crimp Curving | Fixed a broken link to Overpainting. |
| 2 - Editing and rearrangement | 15.4.8 | 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 | Finishing at Ridges and Eaves of Tray Roofing | Typo fix. |
| 1 - Minor Errata | 16 | Maintenance | Some editing for accuracy. |
| 4 - Clause Inserted | Maintenance Compliance | New clause inserted. | |
| 0 - Clause Removed | 16.1 | Improved Durability | Clause removed during the over-all revision of Maintenance. |
| 0 - Clause Removed | 16.2 | Normal Maintenance | This clause was removed during the over-all revision of Maintenance |
| 4 - Clause Inserted | Reactive Maintenance | New clause created during the over-all revision of Maintenance . | |
| 3 - Substantial change to recommendation | 16.3 | Scheduled Maintenance | The clause was revised as part of the overall revision of Maintenance. |
| 3 - Substantial change to recommendation | 16.4 | Preventative Maintenance | This clause was revised during the overall revision of Maintenance. |
| 3 - Substantial change to recommendation | 16.5 | Special Maintenance | This clause was revised during the overall revision of Maintenance. |
| 3 - Substantial change to recommendation | 16.6 | Inspection | Clause revised as part of the over-all revision of Maintenance. |
| 3 - Substantial change to recommendation | 16.7 | Washing | This clause was revised during the overall revision of Maintenance. |
| 3 - Substantial change to recommendation | 16.7.1 | Lichen And Mould | THis clause was revised during the overall revision of Maintenance. |
| 2 - Editing and rearrangement | 16.7.2 | Graffiti | This clause was revised during the overall revision of Maintenance. |
| 3 - Substantial change to recommendation | 16.8 | Overpainting | This clause was revised during the overall revsion of Maintenance. |
| 4 - Clause Inserted | Preparation for Overpainting | New clause created during the overall revision of Overpainting. | |
| 3 - Substantial change to recommendation | 16.8.1 | Unpainted Cladding | This clause has been revised during the overall revision of Maintenance. |
| 2 - Editing and rearrangement | 16.8.2 | Weathered Pre-Painted Cladding | This clause was revised during the overall revision of Maintenance. |
| 2 - Editing and rearrangement | 16.8.3 | White Corrosion | This clause has been revised during the overall revision of Maintenance. |
| 2 - Editing and rearrangement | 16.8.4 | Red Corrosion | This clause was revised during the overall revision of Maintenance. |
| 4 - Clause Inserted | Unweathered Pre-Painted Cladding | New clause created during the overall revision of Maintenance. | |
| 3 - Substantial change to recommendation | 16.8.5 | Application | This clause has been renamed and completely revised during the overall revision of 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 Maintenance. Brush Application is now discussed in Application. |
| 0 - Clause Removed | 16.8.7 | Roller Application | This clause has been removed during the overall revison of Maintenance. Roller Application is now discussed in Application. |
| 0 - Clause Removed | 16.8.8 | Spray Application | This clause has been removed during the overall revison of Maintenance. Spray Application is now discussed in Application. |
| 0 - Clause Removed | 16.9 | Material Selection | This clause was removed during an overall revision of Maintenance. |
| 0 - Clause Removed | 16.9.1 | Residential | This clause was removed during an overall revision of Maintenance. |
| 0 - Clause Removed | 16.9.2 | Commercial | This clause was removed during an overall revision of Maintenance. |
| 0 - Clause Removed | 16.9.3 | Responsibility and Liability | This clause was removed during an overall revision of Maintenance. |
| 0 - Clause Removed | 16.9.4 | Special Environments And Exclusions | This clause was removed during an overall revision of Maintenance. |
| 0 - Clause Removed | 16.11 | Storage | This clause was removed during an overall revision of Maintenance. Storage is dealt with through various clauses under Installation. |
| 2 - Editing and rearrangement | 18.2 | Pitch & Rise Calculator | Renamed from "Roof Pitch Tangent" to "Pitch & Rise Calculator" for clarity. |
| 2 - Editing and rearrangement | 18.5 | Geometry And Measurement | Renamed from "Geometry And Mensuration" to "Geometry And Measurement". |
| 4 - Clause Inserted | 2023 – September | New clause listing revisions for September 2023. |
(optional caption)
Clause:
019_003_000_000_000_000_000_000_000
Clause Number:
19.3
/cop/revision-history/2023-september
Revision Category:
4 - Clause Inserted
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