2023 – June
The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 June 2023.
Substantial change to recommendations:
The main section Structure has been comprehensively revised.
- The revision comprises several changes throughout the main clause and sub-clauses.
- Several clauses were revised in part or completely and illustrations were updated.
- Clauses dealing with fastening patterns and SED Wind Load/Span Graphs are currently being reviewed pending ongoing MRM testing.
- An interactive filter for fastener patterns and load/span graphs is now available in these clauses.
Other important updates:
- A new clause discusses Flashing Buckling in more detail, while the old clause has been renamed Compression Timber.
- Standing Seam Cladding has been renamed Tray Roofing and the entire clause and its sub-clauses have been reviewed.
- The definition of standing seam roofing (a form of tray roofing installed on solid sarking, using traditional seaming tools) has been clarified.
The rest of the updates consisted of minor corrections and edits.
Revision Detail - 2023 - June
| Category | Clause Number (at time of update) | Clause (As of current publication) | Details |
|---|---|---|---|
| 2 - Editing and rearrangement | 1 | Introduction | Updated Revisions Message |
| 2 - Editing and rearrangement | 2.1 | Definitions | Clarified the definition of Standing Seam Profile. |
| 3 - Substantial change to recommendation | 3 | Structure | The main clause Structure has been comprehensively revised. The revision comprises several changes thtoughout the main clause and sub-clauses |
| 4 - Clause Inserted | Standards | New clause to group the standards refered to in Structure in the COP. | |
| 0 - Clause Removed | 3.2 | General | This clause has been merged with the intorductory clause for Structure. |
| 3 - Substantial change to recommendation | 3.3 | AS/AZS 1170.2:2011 | This clause has been revised as part of the overall revision of Structure. |
| 3 - Substantial change to recommendation | 3.4 | NZS 3604:2011 | Changed the description of what NZS 3604 includes. Removed the statement that NZS 3604 is location specific. |
| 4 - Clause Inserted | NASH Standard | New clause to mention the NASH Standard in relation to B1/AS1. | |
| 4 - Clause Inserted | Performance | New clause. This clause was filled with information previously available in the old clause Understanding Loads | |
| 4 - Clause Inserted | Section Properties | New sub-clause discussing how to determine profile strength under load. | |
| 3 - Substantial change to recommendation | 3.15 | Profiles | This clause has been revised as part of the overall revision of Structure. Some copy has been moved to Section Properties |
| 2 - Editing and rearrangement | 3.15.1 | Corrugate Profile | The clause has been revised as part of the overall revision of Structure. |
| 2 - Editing and rearrangement | 3.15.2 | Trapezoidal Profile | revised as part of the overall revision of Structure. |
| 3 - Substantial change to recommendation | 3.15.5 | Miniature Profiles | Deleted reference to metrical or imperial sizing of miniture profiles. |
| 3 - Substantial change to recommendation | 3.15.3 | Secret-fixed Profiles | Clause renamed and combined with Standing Seam (removed). Added an illustration |
| 3 - Substantial change to recommendation | 3.13 | Material Grade | Content had been revised and edited as part of the overall revision of Structure. |
| 3 - Substantial change to recommendation | 3.14 | Material Thickness | The content of this clause was revised as part of the overall revision of Structure. |
| 4 - Clause Inserted | Loads | New introductory clause leading into various clauses dealing with different loads. | |
| 3 - Substantial change to recommendation | 3.5 | Understanding Loads | The clause has been revised and edited as part of the overall revision of Structure. The illustration of Profiled Steel — Flanges and Webs and some content have been moved to Profile Shape. The illustration Compression |
| 0 - Clause Removed | 3.5.1 | Point Load | This clause has been removed as part of the overall revision of Structure. Instead of two clauses |
| 0 - Clause Removed | 3.5.6 | Section Properties | This clause was removed as part of the overall revision of Structure. The information previous contained in this clause has been spread throughout other clauses. |
| 3 - Substantial change to recommendation | 3.5.8 | Continuity | The content of this clause was revised and edited as part of the overall revision of Structure. The illustration for Continuity |
| 2 - Editing and rearrangement | 3.5.4 | Load Distribution | The Load Distribution-clause has been revised and edited as part of the overall revision of Structure. |
| 0 - Clause Removed | 3.5.2 | Wind Load | This clause was merged with Wind Load as part of the overall revision of Structure. |
| 0 - Clause Removed | 3.5.5 | Yield Strength | This clause has been assimilated into a new clause |
| 3 - Substantial change to recommendation | 3.6 | Types of Load | Clauses decribing types of load have been rearranged and revised for clarity and easy of use. Content previously contained to this clause was distributed among it's sub-clauses. |
| 2 - Editing and rearrangement | 3.6.1 | Point Load | This clause revised as part of the overall revision of Structure. |
| 3 - Substantial change to recommendation | 3.7 | Wind Load | Two clauses that previously discussed wind load were merged into one as part of the overall revision of Structure. The content of both clauses were revised and edited to facilitate the merger. |
| 3 - Substantial change to recommendation | 3.7.1 | Local Pressure Factor (Kl) | Corrected illustration Local Pressure for Low Pitch Roofs and deleted Local Pressure Factors C. |
| 2 - Editing and rearrangement | 3.7.2 | Conversion of Wind Speed To Pressure | The content of this clause has been edited as part of a overall revision of Structure. |
| 2 - Editing and rearrangement | 3.8 | Snow Loads | This contents in this clause has been edited for conciseness as part of the overall revision of Structure. |
| 2 - Editing and rearrangement | 3.7.3 | Roof Weight | The content os this clause has been edited for clarity. |
| 3 - Substantial change to recommendation | 3.3.1 | Modes of Failure | The contents of this clause has been edited as part of the overall revision of Structure. |
| 4 - Clause Inserted | Serviceability and Ultimate Failure | Newly created clause discussing Serviceability and Ultimate Failure. | |
| 3 - Substantial change to recommendation | 3.5.3 | Deflection | The content of this clause has been revised as part of the overall revision of Structure. The contents have been merged with Yield Strength |
| 4 - Clause Inserted | Deformation | New clause made up of merged content from Deflection and Yield Strength. | |
| 3 - Substantial change to recommendation | 3.6.2 | Roof Traffic | The content of this has been edited to include a load of 2 kPa applied for accessible roofs. |
| 3 - Substantial change to recommendation | 3.9 | Dead Loads | The content of this clause has been edited as part of the overall revision of Structure. |
| 2 - Editing and rearrangement | 3.1 | Construction Loads | The content is this clause has been revised as part of the overall revision of Structure. A photo to illustrate rib damage due to construction loads was added. |
| 3 - Substantial change to recommendation | 3.5.7 | Fatigue and Brittle Failure | The content of this clause has been revised as part of the overall revision of Structure |
| 4 - Clause Inserted | Fasteners | New introductory clause to sub-clauses dealing with structural requirements for fasteners. | |
| 3 - Substantial change to recommendation | 3.11 | Fastener Loads | The content is this clause has been revised as part of the overall revsion of Structure. |
| 3 - Substantial change to recommendation | 3.12.1.1 | Steel Purlins | This clause has been renamed and merged with Screw Fasteners and Steel Purlins Thicker Than 1 mm. |
| 3 - Substantial change to recommendation | 3.12.2 | Pull-over Values | The content of this clause has been edited as part of the overall revision of Structure. The copy was revised and the table Typical Pull over values for crest fixing (serviceability failure) was removed. |
| 2 - Editing and rearrangement | 3.11.1 | Load-spreading Washers | THis clause has been moved as part of the overall revision of Structure. It now follows Pull-over Values. |
| 0 - Clause Removed | 3.12 | Fastener Performance | This clause has been merged with Fastener Loads. |
| 0 - Clause Removed | 3.12.1 | Screw Fasteners | This clause has been merged with Steel Purlins Thinner Than 1 mm. |
| 0 - Clause Removed | 3.12.1.2 | Steel Purlins Thicker Than 1 mm | This clause was merged with Steel Purlins Thinner Than 1 mm. |
| 0 - Clause Removed | 3.15.4 | Standing Seam | Clause was combined with Trough Section. |
| 1 - Minor Errata | 4 | Durability | Fixed typo. |
| 3 - Substantial change to recommendation | 4.9.4 | Compatibility Table | Correction to the combination of Stainless Steel with Zinc or Zinc coated steel, where runoff from Stainless Steel is not suitable. Amendment of some material descriptions to more common industry terms (Galvanised steel, Colorsteel®/Colorcote®, Zincalume®). Addition of Painted Galvanised Steel. |
| 2 - Editing and rearrangement | 5.5.1 | Valley Fixing | Rearranged layout. |
| 3 - Substantial change to recommendation | 5.5.6 | Asymmetrical Valleys | Added recommendation for valley baffles where roof pitches excced 10°. |
| 3 - Substantial change to recommendation | 8.4.3 | Parapet Cappings | This clause was comprehensivly reviewed and all the illustrations were updated. |
| 1 - Minor Errata | 8.4.4 | Apron Flashings | Edited for clarity. Removed mention of 'hidden flashings' and inserted mention of B2/AS1. |
| 1 - Minor Errata | 8.4.4.4 | Eaves Flashing | The illustration of Gutter-Eaves Flashing has been amended to align with measurements from E2/AS1. |
| 2 - Editing and rearrangement | 8.8 | Compression Timber | Clause renamed. Flashing buckling is discussed in Flashing Buckling. |
| 4 - Clause Inserted | Flashing Buckling | New clause discussing buckling of flashings. | |
| 1 - Minor Errata | 14.11 | Overhang | Drawing tidy up. |
| 3 - Substantial change to recommendation | 15.4 | Tray Roofing | The entire clause Standing Seam Cladding |
| 2 - Editing and rearrangement | 15.4.1 | Tray Profile Materials | Renamed the couse to Tray Profile Materials. |
| 2 - Editing and rearrangement | 15.4.2 | Standing Seam Profiles | Standing Seam Cladding has been revised and renamed to Self-Support and Standing Seam Profiles. |
| 4 - Clause Inserted | Standing Seam Design | New clause discussing standing seam design. | |
| 3 - Substantial change to recommendation | 15.4.3 | Tray Fixings | Standing Seam Fixings has been reviewed |
| 1 - Minor Errata | 15.4.5 | Sarking | Provided full terminology for CPD (Control Panel Directive). |
| 2 - Editing and rearrangement | 15.4.6 | Tray Ventilation | Standing Seam Ventilation has been renamed Tray Ventilation. |
| 2 - Editing and rearrangement | 15.4.7 | Standing Seam Roofing Wind Loads | The clause Standing Seam Roofing Wind Loads has been renamed Tray Roofing Wind Loads. |
| 4 - Clause Inserted | Tray Roofing Wind Noise | New Clause for Tray Roofing Wind Noise. | |
| 2 - Editing and rearrangement | 15.4.8 | Penetrations on Tray Roofing | The clause Penetrations on Standing Seam Cladding has been renamed to Penetrations on Tray Roofing. |
| 3 - Substantial change to recommendation | 15.4.10.3 | Tray Roof Flashing | 1. Clause and illustraions have been renamed |
| 2 - Editing and rearrangement | 15.4.9 | Canning and Purlin Creasing | Removed last line to avoid confusion . |
| 2 - Editing and rearrangement | 15.4.10 | Installing Tray Cladding | Clause renamed |
| 4 - Clause Inserted | Commence Laying Tray Cladding | New clause discussing laying of tray cladding. | |
| 2 - Editing and rearrangement | 15.4.10.2 | Provision for Expansion — Tray Roofing | Photo from Installing Standing Seam Cladding has been moved to Provision for Expansion — Standing Seam Cladding. Clause has been renamed for consistency. |
| 4 - Clause Inserted | Finishing at Ridges adn Eaves of Tray Roofing | New clause describing tray roofing sheet end treatment. | |
| 1 - Minor Errata | 17.1.5.1 | Allowance for Variation | Corrected depreciation factor for clip-fastened products from 30% to 1.3. |
| 4 - Clause Inserted | 2023 – June | New clause with revision details for 1 June 2023. |
(optional caption)
Clause:
019_004_000_000_000_000_000_000_000
Clause Number:
19.4
/cop/revision-history/2023-june
Revision Category:
4 - Clause Inserted
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