COP v3.0:revision-history;

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.

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Revision History

19 Revision History

Policy for Updates to NZ Metal Roof and Wall Cladding Code Practice.

All revisions to clauses of the COP after June 2018 are recorded at 19 Revision History, including a brief explanation of the change.

See sub-clauses for detail of revisions at particular dates.

Revisions are split into 3 categories for simple assessment by users:

19.1 2021 – September

The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 September 2021.

Summary of Changes in this update:

In an important update, the recommendation for freeboard for internal gutters on the 5.3.7 Gutter Capacity Calculator was changed to 30mm to align with E1/AS1 and E1/AS2.
The recommendation for minimum suitable pitch for 9.1 Penetrations Minimum Pitch, has been amended to include modern proprietary profiles.
New clauses with easy-to-use fastener pattern reference tables. The tables would cover most standard corrugated and trapezoidal cladding, for 3.18 G550 Steel Cladding Fastening Pattern Tables and 3.20 Aluminium Fastening Pattern Tables.
Other new clauses were for 5.4.4 Intersecting Valleys and 14.8 Double Lapping.
The drawing in 5.7 Downpipe Spreaders was replaced to give a clearer reflection of the downpipe design and using the online downpipe spreader capacity calculator.

The rest of this update consisted of fixing minor errors.

Category	Clause (As of current publication)	Details
2 - Editing and rearrangement	1 Introduction	Update Revisions Message
4 - Clause Inserted	3.18 G550 Steel Cladding Fastening Pattern Tables	New clause aimed at easy reference of fastening patterns.
4 - Clause Inserted	3.20 Aluminium Fastening Pattern Tables	New clause for easy referencing of fastening patterns for aluminium cladding.
1 - Minor Errata	3.6.2 Roof Traffic	Changed "tradesman" to trades people for gender neutrality.
1 - Minor Errata	3.6.3 Uniformly Distributed Load (Wind or Induced Action)	Corrected spelling of "Uniformly. Included a full term before the abbreviation for UDL in the first sentence.
2 - Editing and rearrangement	5.3.3 Internal Corners	Clause moved from Valleys to Gutters.
3 - Substantial change to recommendation	5.3.7 Gutter Capacity Calculator	The minimum Freeboard on internal gutter calculations has been changed to 30mm to align with E1/AS1 and E1/AS2.
1 - Minor Errata	5.4.2 Valley Design	Inserted cross-reference link to Internal Corners.
4 - Clause Inserted	5.4.4 Intersecting Valleys	New clause showing the correct way to intersect valleys.
2 - Editing and rearrangement	5.7 Downpipe Spreaders	Replaced Downpipe Spreader Design-drawing with a more detailed one.
3 - Substantial change to recommendation	9.1 Penetrations Minimum Pitch	Revised first sentence to make allowance for modern profiles and proprietary profiles.
4 - Clause Inserted	14.8 Double Lapping	New clause.
4 - Clause Inserted	19.1 2021 – September	New Revision clause

19.2 2021 – June

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), are effective 1 June 2021.

COP Clauses 11 Natural Light and 14 Installation were comprehensively reviewed and revised for this update. Users are advised to reread those clauses for the most up-to-date information and recommendations.

Other updates included minor fixes to grammar, layout, and updated drawings and dividing 4.9.4 Compatibility Table into smaller, more usable clauses (with no change to recommendations).

19.2A Revision Detail - 2021 - June

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	3.5.2	3.5.2 Wind Load	Some rewording for clarity.
1 - Minor Errata	4.10.1	4.9.1 Disimilar Metals	Editing for clarity.
2 - Editing and rearrangement	4.10.3	4.9.4 Compatibility Table	The clause was split for ease of use.
3 - Substantial change to recommendation	5.2.2.2	5.2.2.2 Allowance for Short-Term Intensities	Updated Short-term Intensity Factor Explanation.
1 - Minor Errata	5.4.2	5.4.2 Valley Design	UPdated link to the Valley Capacity Calculator.
2 - Editing and rearrangement	8.4.4.4	8.4.4.4 Eaves Flashing	Inserted a paragraph recommending eaves flashings in Marine Environments.
2 - Editing and rearrangement	10.9	10.9 Minimising Ingress of Water Vapour into the Ceiling Cavity	Clause renamed and revised for clarity.
3 - Substantial change to recommendation	11	11 Natural Light	COP Clause 11. Natural Light has been completely revised.
3 - Substantial change to recommendation	11.1	11.1 Clause G7 NZBC	COP Clause 11. Natural Light has been entrile revised.
3 - Substantial change to recommendation	11.2	11.2 Natural Light Materials	COP clause 11. Natural Light has been revised, which includes the clause previously titled "Materials".
0 - Clause Removed	11.3	Types Of Roof Lights	This clause was removed as part of an overall revision of COP clause 11. Natural Light. Illustration of different rooflights can be found in Thermal Expansion and
3 - Substantial change to recommendation	11.4	11.5 Light Transmission	Clause has been revised as part of an overall revision of COP Clause 11. Natural Light.
0 - Clause Removed	11.5	Weathering And Durability	This clause has been removed as part of an overall revision of COP Clause 11. Natural Light. Information about translucent sheeting durability can now be found at Natural Light Performance - Durability,
3 - Substantial change to recommendation	11.6	11.3 Performance – Structure	Clause renamed and content added.
2 - Editing and rearrangement	11.6.1	11.3.1 Point Load on Translucent Sheets	Clause revised and renamed as part of the overall revision of COP Clause 11. Natural Light.
2 - Editing and rearrangement	11.6.2	11.3.2 Distributed Loads on Translucent Sheeting	Clause revised and renamed as part of the overall revision of COP Clause 11. Natural Light.
3 - Substantial change to recommendation	11.7	11.4 Thermal Resistance	Clause has been revised as part of an overall revision of COP Clause 11. Natural Light.
3 - Substantial change to recommendation	14	14 Installation	COP Clause 14. Installation has been significantly reviewed and revised.
1 - Minor Errata	14.1	14.11 Overhang	Drawing tidy up.
3 - Substantial change to recommendation	14.1	14.1 Pre- Installation	This clause has been revised as part of an overall revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.2.2	14.2.2 Ordering	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.2.3	14.2.3 Transportation	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.3	14.3 Accepting Delivery	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.3.1	14.3.1 Unloading	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.3.2	14.3.2 Wet Storage Damage	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.6	14.6 Walking On Roofs	This clause has been reviewed as part of a substantial overall revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.6.1	14.6.1 Footwear	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.7	14.7 Strippable Films	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
4 - Clause Inserted	14.7.1	14.7.1 Storing Product with Strippable Film	This clause has been removed as part of a substantial revision of COP Clause 14. Installation. For handling and storage of products with strippable film, please see Strippable Films.
0 - Clause Removed	14.7.2	Using Strippable Film	This clause has been removed as part of a substantial revision of COP Clause 14. Installation. For using and handling products with strippable film, please see Strippable Films.
1 - Minor Errata	14.9	14.10 Marking and Cutting	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
2 - Editing and rearrangement	14.12.2	14.13.2 Screws	Added "Reduced Diameter Drill Point" to Screw Points. This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
1 - Minor Errata	14.12.3	14.13.3 Clip Fasteners	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.12.4	14.13.4 Rivets	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
1 - Minor Errata	14.13	14.14 Fastener Installation	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
4 - Clause Inserted	14.15	14.16 Stop-ends	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
1 - Minor Errata	14.16	14.17 Turndowns (Drip Forming or Drip Edging)	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
1 - Minor Errata	14.18	14.19 Avoiding Problems	This clause has been renamed as part of an overall revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.18.1	14.19.1 Roof Cladding Damage	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.18.2	14.19.2 Water Ponding	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.18.3	14.19.3 Correctly Installed Gutters	This clause has been reviewed as part of a substantial revision of COP Clause .
3 - Substantial change to recommendation	14.18.4	14.19.4 Swarf Damage	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
0 - Clause Removed	14.18.4.1	Identifying Swarf Stains	This clause has been removed as part of a substantial revision of COP Clause 14. Installation.
3 - Substantial change to recommendation	14.18.4.2	14.19.4.1 Preventing Swarf Damage	This clause has been reviewed as part of a substantial revision of COP Clause 14. Installation.
0 - Clause Removed	14.18.4.3	Swarf Effect on Performance	This clause has been reviewed as part of an overall revision of COP Clause 14. Installation. For more information about swarf effects, please read Swarf Staining and Cut Edge Corrosion.
0 - Clause Removed	14.18.4.4	Repairing Swarf Damage	This clause has been reviewed as part of an overall revision of COP Clause 14. Installation. For more information about dealing with swarf, see Swarf Damage.
2 - Editing and rearrangement	14.18.5	14.19.5 Colour Matching Paint	Inserted picture. This clause has been reviewed as part of an overall revision of COP Clause 14. Installation.
2 - Editing and rearrangement	14.18.7	14.19.7 Sunscreen	Inserted photo of sunscreen damage. This clause has been reviewed as part of an overall revision of COP Clause 14. Installation.
0 - Clause Removed	14.18.8	Removing Lichen	This clause has been removed as part of an overall revision of COP Clause 14. Installation. For information about Lichen, see Lichen.
0 - Clause Removed	14.18.9	Gutter Installation	This clause has been removed as part of an overall revision of COP Clause 14. Installation. For Information about gutters, see Gutters.
1 - Minor Errata	14.19	14.20 Fixing Aluminium Sheeting	Grammar fix. This clause has been reviewed as part of an overall revision of COP Clause 14. Installation.
1 - Minor Errata	14.19.2	14.20.2 Recommendations for Fixing Aluminium	Fixed a link.
4 - Clause Inserted		11.8 Flatsheet Rooflights	New clause created as part of an overall revision of COP Clause 11. Natural Light.
4 - Clause Inserted		14.12.2 Side Laps	New clause created as part of a substantial revision of COP Clause 14. Installation.
4 - Clause Inserted		11.7 Stand-Alone Rooflights	New clause created as part of an overall revision of COP Clause 11. Natural Light.
4 - Clause Inserted		11.6 Installing Translucent Sheets	New clause under COP Clause 11. Natural Light.
4 - Clause Inserted		Natural Light Performance - Durability	New clause.
4 - Clause Inserted		11.1.1 Compliance	New clause dealing with natural light and compliance to NZBC G7.
4 - Clause Inserted		19.2 2021 – June	Revision message for the update on 1 June 2021.

2021 – March

19.3 2021 – March

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.

19.3A Capacity Calculators

Gutter Capacity	5.3.7 Gutter Capacity Calculator
Valley Capacity (both symmetrical and asymmetrical)	5.4.7 Valley Capacity Calculator
Downpipe Capacity	5.6.3 Downpipe Capacity Calculator
Maximum Area Above Spreaders	5.7.1 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.

19.3B 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	5.4.7 Valley Capacity Calculator	Updated calculator to support Asymmetrical Valley calculations, including dynamic illustration.
2 - Editing and rearrangement	5.5.2	5.7.1 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	5.3.2 Gutter Capacity Design	Clause renamed and moved to Types of Gutter.
1 - Minor Errata	5.6.2	5.3.2.3 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	5.7 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	5.3.2.1 Gutter Fall	Clause moved to Gutter Installation and Maintenance.
2 - Editing and rearrangement	5.7.5	5.6.3 Downpipe Capacity Calculator	Illustration updated to show effective head.
2 - Editing and rearrangement	5.8	5.3.7 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		19.3 2021 – March	New Revision clause.

2020 – December

19.4 2020 – December

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.
5.7.1 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.

19.4A 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 Disimilar 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	5.4.6 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	5.7.1 Maximum Area Above Spreader Calculator	New online tool for calculating maximum drainage areas for spreaders.
1 - Minor Errata	5.5	5.3.2 Gutter Capacity Design	Grammar fix.
2 - Editing and rearrangement	5.6.3	5.2.2 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	5.2.2.2 Allowance for Short-Term Intensities	Updated short-term intensity multiplication factors.
2 - Editing and rearrangement	5.7	5.3.7 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 5.2.2 Rainfall Intensity.
0 - Clause Removed	5.7.2	South Island 50-year ARI, 10-minute Rainfall Intensity Map	Map moved to 5.2.2 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		5.4.7 Valley Capacity Calculator	New clause created for Valley Capacity Calculator. The calculator was previously part of Capacity Calculators.
4 - Clause Inserted		5.6.3 Downpipe Capacity Calculator	New clause for Downpipe Capacity Calculators.
4 - Clause Inserted		19.4 2020 – December	New clause showing updates effective on 1 December 2020.

2020 – September

19.5 2020 – September

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP) were published on 1 September 2020.

Summary of Changes in this update:

New standard added for 17.4 MRM Pre-Painted Coil Standard – Performance Requirements.
Additional information on salt contamination added to 4.2 Metal Corrosion.
Revised 2.1 Definitions of Gutter and Valley.
The rest of this update consisted of fixing minor errors and improvements for clarity.

19.5A Revision Detail - 2020 - September

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Update Revisions Message
2 - Editing and rearrangement	2.1	2.1 Definitions	Revised definitions of Gutter and Valley.
2 - Editing and rearrangement	4.2	4.2 Metal Corrosion	Added paragraph about salt contamination.
1 - Minor Errata	5.7	5.3.7 Gutter Capacity Calculator	Clarity improvement. Inserted the Comment: "Please read with Roof Drainage Design "
1 - Minor Errata	9.3	9.3 Penetration Durability and Compatibility	Renamed clause to be more reflective of its content.
1 - Minor Errata	12.4.1	12.4.1 Touch-Up	Changed punctuation in heading for consistency.
2 - Editing and rearrangement	15.2	15.2 Mounting Air Conditioning, Aerials, and Solar Units	Clause has been renamed and new copy included.
2 - Editing and rearrangement	17	17 Testing and MRM Standards	Added introduction.
1 - Minor Errata	18.6	18.6 Velocities	Removed extra heading.
1 - Minor Errata	18.7	18.7 Cricket Penetration Patterns	Fixed headings.
4 - Clause Inserted		17.4 MRM Pre-Painted Coil Standard – Performance Requirements	New clause.
4 - Clause Inserted		17.4.1 Part1: ASNZS/2728:2013	New clause.
4 - Clause Inserted		17.4.2 Part 2: Additional Criteria	New clause.
4 - Clause Inserted		17.4.3 Commentary	New clause.
4 - Clause Inserted		17.4.4 Appendices of AS/NZS 2728:2013 included as Normative in the MRM Standard	New clause.
4 - Clause Inserted		17.4.5 Appendices of AS/NZS2728:2013 considered Informative in the MRM Standard:	New clause.
4 - Clause Inserted		17.4.6 Copyright Acknowledgement	New clause.

2020 – June

19.6 2020 – June

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), are effective 1 June 2020.

New clauses:

In this update, we included new clauses concerning 17.2 MRM Fastener Performance Requirements and Testing and 17.3 MRM Soft Edge Standard.
We updated 3.16 Maximum Span and Fastener Requirements to include 3.19 Aluminium Cladding Wind Load Span Graphs.
We added a new table 5.2.3 Minimum Freeboard Values to 5.2 Roof Drainage Design and implemented interface refinements to 5.3.7 Gutter Capacity Calculator.

The rest of this update consists of minor improvements, such as tidying up drawings and edits for clarity and grammar.

19.6A Revision Detail - 2020 - June

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Update Revisions Message
2 - Editing and rearrangement	3.16.4	3.16.4 Fastener Patterns	Fastener pattern illustrations updated for clarity - no change to intent.
2 - Editing and rearrangement	3.16.5	3.17 Steel Cladding Wind Load Span Graphs	Clause renamed.
2 - Editing and rearrangement	3.16.5.1	3.17.1 Corrugated Steel – 0.40	Clause renamed and Fastener pattern illustrations updated for clarity - no change to intent.
2 - Editing and rearrangement	3.16.5.3	3.17.2 Corrugated Steel – 0.55	Clause renamed and Fastener pattern illustrations updated for clarity - no change to intent.
2 - Editing and rearrangement	3.16.5.2	3.17.3 Trapezoidal Five Rib Steel – 0.40	Clause renamed and Fastener pattern illustrations updated for clarity - no change to intent.
2 - Editing and rearrangement	3.16.5.4	3.17.4 Trapezoidal Five Rib Steel – 0.55	Clause renamed and Fastener pattern illustrations updated for clarity - no change to intent.
2 - Editing and rearrangement	3.16.5.5	3.17.5 Trapezoidal Six Rib Steel – 0.40	Clause renamed and Fastener pattern illustrations updated for clarity - no change to intent.
2 - Editing and rearrangement	3.16.5.6	3.17.6 Trapezoidal Six Rib Steel – 0.55	Clause renamed and Fastener pattern illustrations updated for clarity - no change to intent.
4 - Clause Inserted		3.19 Aluminium Cladding Wind Load Span Graphs	New clause.
4 - Clause Inserted		3.19.1 Corrugated Aluminium – 0.70	New Clause for Aluminium Cladding Wind Load Span Graphs.
4 - Clause Inserted		3.19.2 Corrugated Aluminium – 0.90	New Clause for Aluminium Cladding Wind Load Span Graphs.
4 - Clause Inserted		3.19.3 Trapezoidal Five Rib Aluminium – 0.70	New Clause for Aluminium Cladding Wind Load Span Graphs.
4 - Clause Inserted		3.19.4 Trapezoidal Five Rib Aluminium – 0.90	New Clause for Aluminium Cladding Wind Load Span Graphs.
3 - Substantial change to recommendation	5.6.3	5.2.2 Rainfall Intensity	Clause had been completely revised, with updated Rainfall Intensity Maps at the end of the main Clause, Roof Drainage.
1 - Minor Errata	5.6.3.1	5.2.2.1 Duration	Replaced comparison chart with a simplified one.
2 - Editing and rearrangement	8.3	8.3 Flashing Cover	Added minimum flashing cover values for change of pitch junctions.
4 - Clause Inserted		17 Testing and MRM Standards	New clause.
2 - Editing and rearrangement	17	17.1 Metal Cladding Testing	Clause renamed.
1 - Minor Errata	17.5.1	17.1.5.1 Allowance for Variation	Fixed "overall" to "over all"
4 - Clause Inserted		17.2 MRM Fastener Performance Requirements and Testing	New clause.
4 - Clause Inserted		17.2.1 Requirements for Fastener Testing	New clause.
4 - Clause Inserted		17.2.2 Test Panel Requirements	New Clause.
4 - Clause Inserted		17.2.2.1 Test Location	New Clause.
4 - Clause Inserted		17.2.2.2 Site Orientation	New Clause.
4 - Clause Inserted		17.2.2.3 Preparation of Test Panel	New Clause.
4 - Clause Inserted		17.2.3 Fastener Performance Testing	New Clause.
4 - Clause Inserted		17.2.3.1 Site Testing	New clause.
4 - Clause Inserted		17.2.3.2 Field Performance Validation	New clause.
4 - Clause Inserted		17.2.3.3 Accelerated Testing	New clause.
4 - Clause Inserted		17.2.3.4 Fastener Shanks	New clause.
4 - Clause Inserted		17.2.3.5 Sealing Washer Conductivity	New clause.
4 - Clause Inserted		17.2.4 Appearance	New clause.
4 - Clause Inserted		17.2.5 Weatherproofing	New Clause.
4 - Clause Inserted		17.2.6 Fastener Performance Test Report	New clause.
4 - Clause Inserted		17.3 MRM Soft Edge Standard	New clause.
4 - Clause Inserted		17.3.1 Soft Edge Product Techincal Statement Requirements	New clause.
4 - Clause Inserted		19.6 2020 – June	New clause. Revision detail.
0 - Clause Removed	5.5	Gutters	The clause had been removed. Gutters are now discussed in more detail in a separate clause for each type, under the main clause Types of Gutter.

2020 – March

19.7 2020 – March

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), are effective 1 March 2020.

This update contains only minor revisions, mostly concerning grammar and punctuation fixes.

Editing and rearrangement for clarity

Corrected "upstand angles" of valleys to 90°, removed "Upstand Angles" from Internal Valley Angle Table.
Replaced Comparison of 10-Minute Published Intensity with 1-Minute and 2-Minute Intensities-chart with a simplified chart only showing comparison for 10-year and 50-year ARI.

19.7A Revision Detail - 2020 - 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	5.2	5.3 Gutters	Easier to read layout options.
1 - Minor Errata	5.2.1	5.3.1 External Gutters (Spouting)	Grammar fix.
1 - Minor Errata	5.2.3	5.3.5 Internal Gutters	Grammar fix.
2 - Editing and rearrangement	5.2.4.2	5.4.2 Valley Design	Removed references to "Upstand Angle B" and replaced drawing "Common Valley Shapes"
1 - Minor Errata	5.2.4.6	5.4.6 Asymmetrical Valleys	Punctuation fix.
1 - Minor Errata	5.3.1	5.5.1 Rainwater Heads	Punctuation fix.
1 - Minor Errata	5.3.2	5.5.2 Sumps	Typo fix.
1 - Minor Errata	5.4	5.6 Outlets and Downpipes	Punctuation fix.
1 - Minor Errata	5.5.3	14.18.9 Gutter Installation	Minor Typo Fix.
1 - Minor Errata	5.6.2	5.3.2.1 Gutter Fall	Typo fix.
1 - Minor Errata	5.6.3.1	5.2.2.1 Duration	Replaced comparison chart with a simplified one.
1 - Minor Errata	8.9.1	8.9.1 Flashing Expansion	Grammar fix.

2019 – December

19.8 2019 – December

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), are effective 1 December 2019.

Major Revisions

For this update, the COP section 5 Roof Drainage and all its sub-clauses have been substantially revised. The updates focussed heavily on creating new online tools for calculating Roof Drainage, Gutter Capacity, Downpipe Capacity and Valley Capacity, which are located in 5.3.7 Gutter Capacity Calculator.

Summary of other changes in this update

All the content in 5 Roof Drainage has been updated to provide clarity and brevity, and detail drawings are updated.
The previous methods of capacity calculations, using two distinct methods based on standard sizes, have been removed and replaced by online calculator in 5.3.7 Gutter Capacity Calculator.
New clauses have been added for 17.1.3.2 Point Load Testing and 17.1.1.2 Point Load Testing Standard under 17.1 Metal Cladding Testing.
The Glossary has been updated with 2.1A Definitions for Swiss Gable, Finial, and Profiled Washer; and some minor edits to refine definitions and grammar fixes.

19.8A Revision Detail - 2019 - December

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	1	1 Introduction	Update Revisions Message
2 - Editing and rearrangement	2.1	2.1 Definitions	Revised definition of "Load Spreading Washer", added a new item "Profiled Washer", added definition for "Finial", minor grammatical fixes.
2 - Editing and rearrangement	5	5 Roof Drainage	The entire Roof Drainage-clause had been revised.
1 - Minor Errata	5.1	5.1 NZBC: Clause E1 — Surface Water	Formatting
4 - Clause Inserted		5.3 Gutters	New clause.
4 - Clause Inserted		5.3.1 External Gutters (Spouting)	New clause.
2 - Editing and rearrangement	5.5.5	5.3.4 Concealed Fascia Gutters	This clause had been completely revised and renamed.
2 - Editing and rearrangement	5.5.4	5.3.5 Internal Gutters	Clause completely revised.
4 - Clause Inserted		5.3.5.1 Internal Gutter Design Features	New clause.
2 - Editing and rearrangement	5.6	5.4 Valleys	Valleys had been completely revised and divided into smaller, more specific, sections.
4 - Clause Inserted		5.4.1 Valley Fixing	New clause.
4 - Clause Inserted		5.4.2 Valley Design	New clause.
4 - Clause Inserted		5.3.3 Internal Corners	New clause.
2 - Editing and rearrangement	5.6.2	5.4.3 Bifurcated Valleys	The clause had been revised. Valleys are now discussed in smaller, more specific, clauses.
4 - Clause Inserted		5.4.5 Changing Angles in Valleys	New clause.
4 - Clause Inserted		5.4.6 Asymmetrical Valleys	New clause.
4 - Clause Inserted		7.1.3 Roof Drainage Capacity	New clause.
3 - Substantial change to recommendation	5.5.7	5.3.6 Secret Gutters	Clause revised, for brevity and clarity.
4 - Clause Inserted		5.5 Rainwater Heads, Sumps, and Overflows	New clause.
2 - Editing and rearrangement	5.8.1	5.5.1 Rainwater Heads	Clause revised, now providing more information.
2 - Editing and rearrangement	5.8	5.5.2 Sumps	This clause has been revised.
2 - Editing and rearrangement	5.8.2	5.5.3 Overflows	Clause renamed, Outlets are now discussed under Outlets and Downpipes.
4 - Clause Inserted		5.6 Outlets and Downpipes	New clause.
4 - Clause Inserted		5.6.1 Placement of Downpipes	New clause.
4 - Clause Inserted		5.6.2 Capacity Table for Common Size Downpipes	New clause.
2 - Editing and rearrangement	5.5.1	5.3.2 Gutter Capacity Design	Clause has been revised and edited.
4 - Clause Inserted		5.3.2.2 Maximum Gutter Length	New clause.
2 - Editing and rearrangement	5.5.2	5.3.2.3 Gutter Support Systems	Clause revised.
4 - Clause Inserted		14.18.9 Gutter Installation	New clause.
2 - Editing and rearrangement	5.2	5.2 Roof Drainage Design	Clause had been completely revised.
2 - Editing and rearrangement	5.3.1	5.2.1 Catchment Area	Caluse has been completely revised. All calculations are now under a new clause Capacity Calculations.
2 - Editing and rearrangement	5.5.8	5.3.2.1 Gutter Fall	Clause revised and renamed.
3 - Substantial change to recommendation	5.3	5.2.2 Rainfall Intensity	Clause had been completely revised, with updated Rainfall Intensity Maps at the end of the main Clause, Roof Drainage.
4 - Clause Inserted		5.2.2.2 Allowance for Short-Term Intensities	New clause.
4 - Clause Inserted		5.2.2.1 Duration	New clause
2 - Editing and rearrangement	5.3.2	5.3.7 Gutter Capacity Calculator	The old clause, Capacity Calculations, replaced by a new clause of the same name but including new online tools.
4 - Clause Inserted		5.7.1 North Island 50-year ARI, 10-minute Rainfall Intensity Map	New clause.
4 - Clause Inserted		5.7.2 South Island 50-year ARI, 10-minute Rainfall Intensity Map	New clause.
4 - Clause Inserted	8.3	8.3 Flashing Cover	Adjusted spacing in Table 8.3A
2 - Editing and rearrangement	8.4.4.3	8.4.4.3 Step Apron	Removed reference to "Fortress Fasteners" in drawing A: Step Apron Details.
4 - Clause Inserted	8.4.4.4	8.4.4.4 Eaves Flashing	Drawing 8.4.4.4A renamed to Gutter Flashing.
2 - Editing and rearrangement	12.2	12.2 Purlin Creasing	Inserted photograph.
4 - Clause Inserted	17.1.2	17.1.1.2 Point Load Testing Standard	New Clause.
4 - Clause Inserted	17.3.2	17.1.3.2 Point Load Testing	New clause.
1 - Minor Errata	18.8	18.8 Sheet Metal Work For Roofing Contractors.	Clause revised for gender neutrality. No significant changes.
4 - Clause Inserted		19.8 2019 – December	Summary of Changes – December 2019
0 - Clause Removed	5.3.2.1	Method 1: Gutter and Downpipe Capacity Determined by Graph	These methods have been replaced by online capacity calculating tools.
0 - Clause Removed	5.3.2.3	Method 2: Gutter and Downpipe Capacity Determined by Calculations	These methods have been replaced by online capacity calculating tools.
0 - Clause Removed	5.3.3	Roof Cladding Capacity	These methods have been replaced by online capacity calculating tools.
0 - Clause Removed	5.4	Snow	Clause removed, Snow and hail are comprehensively discussed in Snow Loads.
0 - Clause Removed	5.4.1	Hail	Clause removed. Leaf guards and maintenance are discussed under Gutter Maintenance.
0 - Clause Removed	5.5	Gutters	The clause had been removed. Gutters are now discussed in more detail in a separate clause for each type, under the main clause Types of Gutter.
0 - Clause Removed	5.5.3	Eaves Gutters	Clause deleted. Now discussed under External Gutters.
0 - Clause Removed	5.6.1	Valley Catchment	This clause had been replaced with the newly developed online tool in Valley Capacity Calculations.
0 - Clause Removed	5.7	Downpipes	Information previously contained in this clause is now discussed in Outlets and Downpipes.
Out-of-band updates 16/12/2019
2 - Editing and rearrangement	5.4.2A	5.6.2 Capacity Table for Common Size Downpipes	Removed obsolete column for Roof Area Drained as the online calculator replaces this.
2 - Editing and rearrangement	5.7	5.3.7 Gutter Capacity Calculator	Added link to Common Sized Downpipes.

2019 – August

19.9 2019 – August

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), are effective 1 August 2019.

Major Revisions

The main clause 17.1 Metal Cladding Testing was substantially revised to give more practical guidance for testing in accordance with the NZ MRM Code of Practice.
The main clause 13 Safety has been substantially revised and updated to closer reflect the Health and Safety at Work Act 2015, referencing the documents Worksafe: Working on Roofs and Worksafe: Working at Height in New Zealand.
The sub-clause 14.20A Fixing Aluminium has been substantially revised to better reflect good trade practice and manufacturers’ recommendations.

Summary of other changes in this update

9.4 Penetration Design has been reorganised so sheetmetal back curb designs are now shown in different clauses for corrugated and trapezoidal profiles.
9.4 Penetration Design now includes an easy-use-use guide for penetration flashing design.
Previously missing design details have been added for 9.4.2.6F Cricket Under-Soaker: Trapezoidal and 9.4.2.6D Arrowhead Under-Soaker: Trapezoidal.
Trough Section and Standing Seam have been added to 3.15 Profile Shape descriptions in Structure.

19.9A Revision Detail - 2019 - August

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
4 - Clause Inserted		19.9 2019 – August	Summary of Changes – August 2019
1 - Minor Errata	10.5	10.5 Building Airtightness	Minor erata: changed 36.2 to 3602
0 - Clause Removed	9.4	Penetration Positioning	Clause is now included in Penetration Design.
2 - Editing and rearrangement	9.5	9.4 Penetration Design	Revised clause. Penetration Positioning is now included in this clause.
1 - Minor Errata	14.8	14.9 Setting Out	Typo correction
4 - Clause Inserted	9.6	9.5 Boot Flashings	Changed the word profile to profiles for consistency with the rest of the document.
4 - Clause Inserted		9.4.2.4 Sheetmetal Penetration-Flashings Reference	New clause to compare penetration flashing options.
2 - Editing and rearrangement	9.5.3	9.4.1.2 Under-Soaker Back Flashings	Clause renamed for consistency.
1 - Minor Errata	9.5.4.3	9.4.2.3 Cricket Back Curbs	Changed kerb to curb for consistency.
1 - Minor Errata	8.3	8.3 Flashing Cover	Corrected a misprint, removed <20mm from aprons, category B.
1 - Minor Errata	14.13.4	14.14.4 Fastener Allowance for Expansion	Fixed 8 mm for style consistency.
2 - Editing and rearrangement	14.12.1	14.13.1 Nails	Photo of Nail Pull-Out inserted.
4 - Clause Inserted		14.20.1 Painted Aluminium	Newly created clause dealing with Painted Aluminum products
4 - Clause Inserted		14.20.2 Recommendations for Fixing Aluminium	Newly created clause setting out COP recommendations for fixing aluminium claddding.
0 - Clause Removed	13	Site Practice	Clause removed. Topics previously discussed in Site Practice is now dealt with in more detail in various clauses under Installation.
3 - Substantial change to recommendation	13.1	13 Safety	Safety has been updated in accordance with the Health and Safety at Work Act 2015 (HSWA 2015).
3 - Substantial change to recommendation	13.1.1	13.2 Responsibilities	Clause updated in accordance with the Health and Safety at Work Act (HSWA) 2015.
3 - Substantial change to recommendation	13.1.7	13.4.1 Scaffolding	Clause has been substantially revised in accordance with Worksafe: Working at height in New Zealand.
3 - Substantial change to recommendation	13.1.10	13.4.3 Safety Mesh	This clause has been substantially revised in accordance with Worksafe: Working at Height in New Zealand.
4 - Clause Inserted		13.4.6 Safety Harness	New clause.
4 - Clause Inserted		13.4.7 Soft Landing Systems	New clause.
2 - Editing and rearrangement	14.21	14.22 Tools Of The Trade	Picture added: Turn Up and Turn Down Tools.
2 - Editing and rearrangement	9.5.2	9.4.1.1 Over-Flashed (Watershed) Back Flashings	Clause has been renamed.
0 - Clause Removed	13.1.2	Training	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.5	Limitations Of Fall Arrest And Travel Restraint	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.4	Residential And Light Commercial Roofing	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.13	Roof Access During Construction	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.12	Joining Safety Mesh	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.11	Steel Fixing	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.9	Personal Safety	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.8	Mobile Scaffolds	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
0 - Clause Removed	13.1.6	Access	Clause removed. Whole main clause (Safety) has been substantially revised in accordance with HSWA 2015 and Worksafe guidelines.
4 - Clause Inserted		13.4.5 Mechanical Access Plant	New clause.
4 - Clause Inserted		13.4.4 Safety Netting	New clause.
4 - Clause Inserted		13.3.3 Weather Conditions	New clause.
4 - Clause Inserted		13.3.2 Assessment of Existing Roof Cladding	New clause.
4 - Clause Inserted		13.3.1 Safe Access to Roofs	New clause.
4 - Clause Inserted		13.3 Working on Roofs	New clause.
4 - Clause Inserted		13.2.4.1 Other People's Responsibilities	New clause.
4 - Clause Inserted		13.2.4 Other People	New clause.
4 - Clause Inserted		13.2.1 PCBU	New clause.
4 - Clause Inserted		13.2.3.1 Workers' Responsibilities	New clause.
4 - Clause Inserted		13.2.3 Workers	New clause.
4 - Clause Inserted		13.2.2.1 Officer Responsibilities	New clause.
4 - Clause Inserted		13.2.2 Officers	New clause.
4 - Clause Inserted		13.2.1.1 PCBU Responsibilities	New clause.
4 - Clause Inserted	9.5.5	9.4.2.5 Sheetmetal Flashings on Corrugated Profiles	This clause has been revised and renamed to specifically show sheetmetal flashings on corrugated profiles.
4 - Clause Inserted		3.15.4 Standing Seam	New clause.
4 - Clause Inserted		3.15.3 Trough Section	New clause.
2 - Editing and rearrangement	14.3.2	14.3.2 Wet Storage Damage	Removed reference to "Fretting".
2 - Editing and rearrangement	2.1	2.1 Definitions	Updated Glossary item: "Fretting"
2 - Editing and rearrangement	4.12	4.11 Inert Catchment	Inserted photo "Localised Damage due to Inert Catchment".
1 - Minor Errata	14.4	14.4 Site Safety	Fixed link: Safety
1 - Minor Errata	14.5	14.5 Handling	Minor grammatical fix.
1 - Minor Errata	14.7.1	14.7.1 Storing Product with Strippable Film	Grammar fix.
1 - Minor Errata	14.7.2	14.7.2 Using Strippable Film	Grammar fix.
1 - Minor Errata	14.1	14.11 Overhang	Drawing tidy up.
4 - Clause Inserted		17.1 Metal Cladding Testing	New Clause, to replace Testing.
4 - Clause Inserted		17.1.1 Standards: AS Standards and COP Testing Standard	New clause.
4 - Clause Inserted		17.1.2 Test Requirements	New Clause
4 - Clause Inserted		17.1.2.1 Supporting Structure and Equipment	New Clause
4 - Clause Inserted		17.1.2.2 Test Set-up	New clause.
4 - Clause Inserted		17.1.2.2.1 Number of Specimens	New clause.
4 - Clause Inserted		17.1.2.2.2 Width of Specimen	New clause.
4 - Clause Inserted		17.1.2.2.3 Number of Spans	New clause.
4 - Clause Inserted		17.1.3 Testing Procedure	New clause.
4 - Clause Inserted		17.1.3.1 UDL Testing	New clause.
4 - Clause Inserted		17.1.5 Publishing Results	New clause.
4 - Clause Inserted		17.1.5.1 Allowance for Variation	New clause.
0 - Clause Removed	17	Testing	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.2	Background to Scope	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.1	Scope	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.3	General Methods Of Testing Sheet Roof And Wall Cladding	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.4	Commentary On 16.3	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.5	Determining Wind load Span Graphs	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.6	Specific Methods Of Testing Sheet Roof And Wall Cladding	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.7	Wind and Point Load Testing	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.8	Method: Resistance To Wind Pressures For New Zealand	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
0 - Clause Removed	17.9	Background to wind load testing	The entire clause Testing has been substantially revised and published as Structural Testing to give better guidance on testing according to the Code of Practice Standards.
4 - Clause Inserted		17.1.5.3 Interpreting Point Load Results	New clause.
4 - Clause Inserted		17.1.3.2 Point Load Testing	New clause.
4 - Clause Inserted		17.1.1.1 UDL Load Testing Standard	New clause.
4 - Clause Inserted		9.4.2.7 Cricket Over-Flashing More Than 1 m Wide	New clause.
4 - Clause Inserted		9.4.3 Dormer Details	New clause.
4 - Clause Inserted		17.1.1.2 Point Load Testing Standard	New Clause.
1 - Minor Errata	14.2.2	14.2.2 Ordering	Punctuation fix.
3 - Substantial change to recommendation	13.1.3.1	13.4.2 Roof Edge Protection	Clause has been substantially revised in accordance with Worksafe: Working at Height in New Zealand.
3 - Substantial change to recommendation	13.1.3	13.4 Working At Height	Clause has been substantially revised in accordance with the HSWA 2015.
4 - Clause Inserted		9.4.2.6 Sheetmetal Flashings on Trapezoidal Profiles	New clause, specifically showing penetration flashings on trapezoidal profiles.
3 - Substantial change to recommendation	14.19	14.20 Fixing Aluminium Sheeting	Section comprehensively revised to better reflect good trade practice and Manufacturer’s recommendations.
2 - Editing and rearrangement	3.15	3.15 Profile Shape	Inserted new Drawing: Profile Types
2 - Editing and rearrangement	3.15.2	3.15.2 Trapezoidal Profile	Removed drawing in favour of a more descriptive drawing: Profile Types.
4 - Clause Inserted	9.5.1	9.4.1 Sheetmetal Penetration Back Flashings	Table removed.
4 - Clause Inserted		17.1.4 Test Report	New clause.
4 - Clause Inserted		17.1.5.2 Interpreting UDL Load Results	New clause.
4 - Clause Inserted		17.1.3.2 Point Load Testing	New clause.

2019 – May

19.10 2019 – May

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), are effective 1 May 2019.

Important updates:

The main clause Roof Ventilation was renamed 10 Internal Moisture and completely revised and updated. The revised clause recommends designing and installing roof cladding to allow natural ventilation in residential buildings and requires design to enable ventilation in skillion, sarked, and low-pitched residential roofs.

Summary of other changes in this update

The main clause 14 Installation was revised and updated for clarity.
Some clauses from 13 Site Practice were moved to be included in the more relevant clause Installation. Site Practice now contains mainly 13 Safety.
Some clauses in 17 Testing were renamed and renumbered to fix broken links and reflect content more accurately. A major revision of 17 Testing is underway.
Other changes are Category 1 updates, which fixed minor errata such as grammar, spelling, and layout.

19.10A Revision Detail - 2019 - May

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	2.1	2.1 Definitions	Updated Glossary to include the terms: "Square Stopping".
2 - Editing and rearrangement	3.5.4	3.5.4 Load Distribution	Minor edit to drawing (3.5.4C Deflection and the Square of Depth )
1 - Minor Errata	3.12.1.1	3.12.1.1 Steel Purlins Thinner Than 1 mm	Edited for Consistency – changed 1.1 mm to 1 mm.
1 - Minor Errata	4.1	4.1 NZBC Clause B2 (Extract)	Revised for clarity.
1 - Minor Errata	4.1.1	4.1.1 B2 Objective	Reformatting
1 - Minor Errata	4.1.2	4.1.2 B2 Functional Requirements	Reformatting
1 - Minor Errata	4.1.3	4.1.3 Performance Requirements	Reformatting
2 - Editing and rearrangement	4.11.6	4.10.6 Capillary Action	Changed minimum cover in 4.10.6B Roofing Sheet End Lap to closer reflect MRM recommendations and renamed the drawing.
1 - Minor Errata	5.3.2.3	5.3.2.3 Method 2: Gutter and Downpipe Capacity Determined by Calculations	Fixed broken link to E Standard Gutter Capacity and F Standard Down Pipe Capacity, and rewrote link copy for greater clarity.
2 - Editing and rearrangement	8.9.1	8.9.1 Flashing Expansion	First line revised for clarity.
2 - Editing and rearrangement	10	10 Internal Moisture	Clause renamed to Internal Moisture. Clause revised for clarity.
2 - Editing and rearrangement	10.1	10.9 Minimising Ingress of Water Vapour into the Ceiling Cavity	Clause renamed and revised for clarity.
4 - Clause Inserted	10.1.1	10.1.1 E3 Objective	New Clause
4 - Clause Inserted	10.1.2	10.1.2 E3 Functional Requirements	New Clause created
4 - Clause Inserted	10.1.3	10.1.3 E3 Performance Requirements	New clause created.
4 - Clause Inserted	10.2	10.2 Why Manage Internal Moisture	Newly created clause
2 - Editing and rearrangement	10.4	10.3 Special Requirements	Clause revised for clarity and relevance.
0 - Clause Removed	10.4	10.4 The External Environment	Clause removed, information has been revised and moved to other main clauses.
2 - Editing and rearrangement	10.5	10.4 Condensation	Clause completely rewritten.
2 - Editing and rearrangement	10.6	10.5 Building Airtightness	Clause completely rewritten.
0 - Clause Removed	10.6.1	10.6.1 Natural Ventilation	Clause removed. New drawings used in more relevant clauses.
4 - Clause Inserted	10.7	10.6 Insulation	Newly created clause.
4 - Clause Inserted	10.7.1	10.6.1 Insulation Position	Newly created clause
4 - Clause Inserted	10.7.2	10.6.2 Other Insulation	Newly created clause
0 - Clause Removed	10.7.4.1	10.7.4.1 Direction of Lay	Clause delted. Information is now discussed in Horizontal laying and Vertical laying.
0 - Clause Removed	10.7.5	10.7.5 Non-Residential Buildings	Clause removed. Information is discussed elsewhere.
2 - Editing and rearrangement	10.8	10.7 Climate	Clause revised for clarity.
0 - Clause Removed	10.8	10.8 Wall Underlay	Clause removed and content discussed i other relevant clauses.
4 - Clause Inserted	10.8.1	10.7.1 Humidity	Relative humidity (RH, given in per cent [%]), is the most widely known method: It gives the content of water vapour in the air relative to the maximum amount of water this parcel of air can hold at its present temperature. Other measures are absolute humidity and water vapour pressure.
2 - Editing and rearrangement	10.9	10.8 Moisture Sources	Renamed and revised clause for clarity. Lead clause for various "Sources of Internal Moisture"
4 - Clause Inserted	10.9.1	10.8.1 Occupant Behaviour	Newly created clause, combining new information with some from revised "Managing Water Vapout at the Source" (renamed Sources of Internal Moisture).
4 - Clause Inserted	10.9.2	10.8.2 Heating	Newly created clause
2 - Editing and rearrangement	10.9.4	10.8.4 Construction Moisture	Clause revised for clarity.
4 - Clause Inserted	10.9.5	10.8.5 Ground Moisture	Newly created clause
2 - Editing and rearrangement	10.11	10.10 Ventilation Pathways	Clause revised for clarity.
4 - Clause Inserted	10.11.1	10.10.1 Types of Ventilation	Newly created clause
4 - Clause Inserted	10.11.1.1	10.10.1.1 Soffit Vents	Newly created clause.
4 - Clause Inserted	10.11.1.2	10.10.1.2 Fascia Vents	Newly created clause
4 - Clause Inserted	10.11.1.3	10.10.1.3 Ridge Vents	Clause renamed and revised for clarity.
2 - Editing and rearrangement	10.11.1.4	10.10.1.4 Turbine Vents	Clause revised for clarity.
4 - Clause Inserted	10.11.2	10.10.2 Battens	Newly Created clause.
2 - Editing and rearrangement	10.12	10.11 Underlay	Clause revised and expanded for clarity.
4 - Clause Inserted	10.12.1	10.11.1 Underlay Requirements	Newly created clause.
2 - Editing and rearrangement	10.12.2	10.11.2 Types Of Underlay	Clause revised for clarity.
4 - Clause Inserted	10.12.3	10.11.3 Underlay Usage	Clause revised for clarity.
2 - Editing and rearrangement	10.12.4	10.11.4 Underlay Durability	Clause revised and expanded.
2 - Editing and rearrangement	10.12.5	10.11.5 Installing Underlay	Clause revised and expanded.
4 - Clause Inserted	10.12.5.1	10.11.5.1 Horizontal Laying	Newly created clause.
4 - Clause Inserted	10.12.5.2	10.11.5.2 Vertical Laying	Newly created clause.
2 - Editing and rearrangement	10.12.5.3	10.11.5.3 Underlay Support	Clause revised.
2 - Editing and rearrangement	10.13	10.12 Additional Information	Clause renamed to Additional Information.
2 - Editing and rearrangement	10.13.1	10.12.1 Cold Roofs	Clause revied for clarity.
2 - Editing and rearrangement	10.13.2	10.12.2 Warm Roofs	Clause revised for clarity.
2 - Editing and rearrangement	10.13.3	10.12.3 Night Sky Radiation	Clause revised for clarity.
2 - Editing and rearrangement	10.13.4	10.12.4 The Mechanics of Condensation	Clause revised and renamed, it is now: The Mechanics of Condesation.
4 - Clause Inserted	10.13.5	10.12.5 Underlay Standards	Newly created clause.
4 - Clause Inserted	10.13.6	10.12.6 Relative Humidity	Newly created clause
4 - Clause Inserted	10.13.7	10.12.7 Absolute Humidity	Newly created clause
4 - Clause Inserted	10.13.8	10.12.8 Water Vapour Pressure	Newly created clause
2 - Editing and rearrangement	13.2	13.1.13 Roof Access During Construction	Clause movved to 13 Safety
0 - Clause Removed	13.4	13.4 Acceptance Of Materials	class="views-field views-field-field-revision-message-revision-id">
0 - Clause Removed	13.4.1	13.4.1 Presence Of Moisture Between Sheets	Clause combined with 14.3.2 Wet Storage Damage
0 - Clause Removed	13.4.2	13.4.2 Colour Match	Clause combined with 14.19.5 Colour Matching Paint
0 - Clause Removed	13.4.3	13.4.3 Storage Stain	Clause removed.
0 - Clause Removed	13.5	13.5 Roof Loading	Clause combined with 14.3.1 Unloading
2 - Editing and rearrangement	14	14 Installation	Clause revised for clarity.
2 - Editing and rearrangement	14.1	14.1 Pre- Installation	Clause revised for clarity.
2 - Editing and rearrangement	14.1	14.11 Overhang	Clause revised for clarity
0 - Clause Removed	14.1	14.10 Metal Roof Defects	Clause removed. See 14.19.1 Roof Cladding Damage
0 - Clause Removed	14.1.5	14.1.5 Cutting And Drilling	Clause deleted. Information was spread through other clauses, mainly 14.18.4.4 Repairing Swarf Damage
4 - Clause Inserted	14.2	14.2 Product Selection	Newly Created Clause
2 - Editing and rearrangement	14.2	14.21 Completion	Clause revised for clarity.
4 - Clause Inserted	14.2.1	14.2.1 Measuring	Newly created clause
0 - Clause Removed	14.2.1	14.2.1 Swarf Removal	clause removed, subject is now discussed in 14.19.4.1 Preventing Swarf Damage.
4 - Clause Inserted	14.2.2	14.2.2 Ordering	Newly created clause.
2 - Editing and rearrangement	14.2.3	14.2.3 Transportation	Clause revised for clarity and moved to 14 Installation.
4 - Clause Inserted	14.3	14.3 Accepting Delivery	New created clause, combining Acceptance of Materials, previously in Site Practice.
4 - Clause Inserted	14.3.1	14.3.1 Unloading	Newly created clause
0 - Clause Removed	14.3.1	14.3.1 Primary Fasteners	Clause removed. Information is now discussed in various shorter and newly created clauses.
4 - Clause Inserted	14.3.2	14.3.2 Wet Storage Damage	Newly created clause
0	14.4	14.4 Secondary Fasteners	class="views-field views-field-field-revision-message-revision-id">
0 - Clause Removed	14.4.2	14.4.2 Monel Rivets	clause removed, information is now discussed in other clauses.
0 - Clause Removed	14.4.3	14.4.3 Aluminium Rivets	Clause removed, information now in 14.13.4 Rivets
0 - Clause Removed	14.4.4	14.4.4 Stainless Steel Rivets	Clause deleted. See 14.13.4 Rivets
0 - Clause Removed	14.4.6	14.4.6 Fastener Frequency	Clause removed. See 14.14.1 Fastener Spacing
2 - Editing and rearrangement	14.5	14.5 Handling	Clause revised for clarity and moved to Installation.
0 - Clause Removed	14.5.2	14.5.2 Pan Fixing	Clause Removed. See 14.13.2 Screws
0 - Clause Removed	14.5.3	14.5.3 Expansion Fixings	Clause removed. See 14.14.4 Fastener Allowance for Expansion
0 - Clause Removed	14.5.4	14.5.4 Lap Stitching	Clause removed. Information absorbed in other clauses.
2 - Editing and rearrangement	14.6	14.6 Walking On Roofs	Clause revised for clarity and moved to 14 Installation.
0 - Clause Removed	14.6	14.6 Installation	Empty heading removed. See 14.14 Fastener Installation.
4 - Clause Inserted	14.6.1	14.6.1 Footwear	Newly created clause
2 - Editing and rearrangement	14.7	14.7 Strippable Films	Clause revied for clarity.
0 - Clause Removed	14.7	14.7 Re-Roofing	Clause removed. Information absorbed in other clauses.
4 - Clause Inserted	14.7.1	14.7.1 Storing Product with Strippable Film	Newly created clause
2 - Editing and rearrangement	14.8	14.9 Setting Out	Clause revised for clarity.
0 - Clause Removed	14.8.2	14.8.2 Side Lap Fixing Between Purlins	Clause removed.
0 - Clause Removed	14.8.6	14.8.6 Purlin Protection	clause removed
0 - Clause Removed	14.8.7	14.8.7 Drainage	Clause removed
0 - Clause Removed	14.8.8	14.8.8 Condensation	Clause removed.
4 - Clause Inserted	14.9	14.10 Marking and Cutting	Newly created clause
2 - Editing and rearrangement	14.11	14.12 Sealing and Joining	Clause revised for clarity
4 - Clause Inserted	14.11.1	14.12.1 Sealing End Laps	Newly created clause
2 - Editing and rearrangement	14.12	14.13 Fasteners	Clause revised for clarity.
0	14.12.1	14.13.1 Nails	class="views-field views-field-field-revision-message-revision-id">
2 - Editing and rearrangement	14.12.2	14.13.2 Screws	Clause revised for clarity.
4 - Clause Inserted	14.12.3	14.13.3 Clip Fasteners	Newly created clause.
2 - Editing and rearrangement	14.12.4	14.13.4 Rivets	Clause revised for clarity
2 - Editing and rearrangement	14.13	14.14 Fastener Installation	Clause renamed and revised for clarity.
2 - Editing and rearrangement	14.13.1	14.14.1 Fastener Spacing	Newly created clause
4 - Clause Inserted	14.13.2	14.14.2 Fastener Placement	Newly created clause
4 - Clause Inserted	14.13.3	14.14.3 Fastener Seating	Newly created clause
4 - Clause Inserted	14.13.4	14.14.4 Fastener Allowance for Expansion	Newly created clause
4 - Clause Inserted	14.14	14.15 Modes Of Fastener Failure	Clause revised for clarity
4 - Clause Inserted	14.15	14.16 Stop-ends	Clause revised for clarity.
2 - Editing and rearrangement	14.16	14.17 Turndowns (Drip Forming or Drip Edging)	Clause revised for clarity.
4 - Clause Inserted	14.17	14.18 Soft edging and Flashing	Newly created clause
4 - Clause Inserted	14.18	14.19 Avoiding Problems	Newly created clause heading
2 - Editing and rearrangement	14.18.1	14.19.1 Roof Cladding Damage	Clause revised for clarity and moved to 14 Installation
4 - Clause Inserted	14.18.2	14.19.2 Water Ponding	Newly created clause
4 - Clause Inserted	14.18.3	14.19.3 Correctly Installed Gutters	Newly created clause
0	14.18.4	14.19.4 Swarf Damage	class="views-field views-field-field-revision-message-revision-id">
4 - Clause Inserted	14.18.4.1	14.18.4.1 Identifying Swarf Stains	Newly created clause
4 - Clause Inserted	14.18.4.2	14.19.4.1 Preventing Swarf Damage	Newly created clause
4 - Clause Inserted	14.18.4.3	14.18.4.3 Swarf Effect on Performance	Newly created clause.
2 - Editing and rearrangement	14.18.4.4	14.18.4.4 Repairing Swarf Damage	Clause revised for clarity and renamed.
4 - Clause Inserted	14.18.4.5	14.19.4.2 Severe or Extensive Swarf Staining	Newly created clause.
4 - Clause Inserted	14.18.5	14.19.5 Colour Matching Paint	Newly created clause
4 - Clause Inserted	14.18.6	14.19.6 Field Painting	Newly created clause.
4 - Clause Inserted	14.18.7	14.19.7 Sunscreen	Newly created clause.
4 - Clause Inserted	14.18.8	14.18.8 Removing Lichen	Newly created clause.
2 - Editing and rearrangement	14.21	14.22 Tools Of The Trade	Claused revised for clarity.
4 - Clause Inserted	14.21.1	14.22.1 Spacing	Clause removed. See 14.14.1 Fastener Spacing
4 - Clause Inserted	14.22.1	14.23.1 Crest Fixing	Clause removed. See 14.13.2 Screws
4 - Clause Inserted	14.23	14.6.2 Tools	Clause removed. See 14.13.2 Screws
4 - Clause Inserted	14.24	14.8 Translucent Sheeting	Clause removed.
4 - Clause Inserted	14.24.1	14.8.1 Side-Lap Fixing	Clause removed.
4 - Clause Inserted	14.24.2	14.8.3 End Laps	Clause deleted.
4 - Clause Inserted	14.24.3	14.8.4 Midspan Supports	Clause removed
4 - Clause Inserted	14.24.4	14.8.5 Stopends	Clause removed.
4 - Clause Inserted	14.24.5	14.8.9 Pitch	Clause removed.
2 - Editing and rearrangement	17	17 Testing	Edited for clarity.
2 - Editing and rearrangement	17.1	17.1 Scope	Clause revised for clarity
1 - Minor Errata	17.1.2	17.1.2 Resistance to point load	Fixed typos – "serviceability" and "strength".
2 - Editing and rearrangement	17.2	17.2 Background to Scope	Heading changed from "Commentary on 16.1" and clause revised for clarity and brevity.
4 - Clause Inserted	17.4	17.4 Commentary On 16.3	Clause removed
2 - Editing and rearrangement	17.5	17.5 Determining Wind load Span Graphs	Minor grammatical edits and clause renamed to "Determining Wind Load Span Graphs" to avoid confusion with 3.17 Steel Cladding Wind Load Span Graphs.
1 - Minor Errata	17.6	17.6 Specific Methods Of Testing Sheet Roof And Wall Cladding	Clause moved (renumbered) to follow 17.7 Wind and Point Load Testing.
4 - Clause Inserted	17.7.1	17.7.1 Commentary On Section 15.5	Clause Removed. 17 Testing to undergo major revision.
2 - Editing and rearrangement	17.9	17.9 Background to wind load testing	Renamed "Clause from Commentary on 16.6".

2019 – February

19.11 2019 – February

The following updates to the NZ Metal Roof and Wall Cladding Code Practice (COP), is effective 1 February 2019.

In this update, no recommendations have been altered that would require changes to existing projects in progress.

Summary of Changes in this Update

Two new clauses were added in 3 Structure to discuss 3.13 Material Grade and 3.14 Material Thickness.
Two new, separate, clauses under 4.15 Clearances, discuss 4.15.1 Ground Clearance and related 4.15.2 Site Management in more detail.
Clauses dealing with 3.12.1 Screw Fasteners fixing to specific purlin types re-ordered for clarity.
New drawing to show recommended 9.4A Recommended Penetration Type Positioning.
Other updates consist of Category 1 – minor errata corrections to spelling, and grammar and layout.

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	3.12.1	3.12.1 Screw Fasteners	Clauses dealing with fixing to specific purlin types re-ordered for clarity.
1 - Minor Errata	3.13.1	3.15.1 Corrugate Profile	Minor grammatical editing for clarity.
1 - Minor Errata	3.14.3	3.16.3 Maximum Spans for Corrugate Wall Cladding	Heading says 0.40 mm but Table is .40 and .55. So remove .40 from heading
1 - Minor Errata	4.6.1	4.6.1 Assessment of Marine Environments	Removed full stop from the heading.
2 - Editing and rearrangement	4.8.1	4.8.4 Lichen	Resized photo (4.8.4A Lichen on a Metal Roof) and inserted photo (4.8.4B Permanent Damage from Lichen Growth.
2 - Editing and rearrangement	4.15	4.14 Swarf Staining and Cut Edge Corrosion	Renamed clause. Resized photos and inserted new photo ( 4.14D Cut Edge Corrosion )
1 - Minor Errata	4.17.3	4.16.3 Aluminium	fixed spelling of "quaters" to quarters
1 - Minor Errata	4.18.1.3	4.17.1.3 Top Coat and Backer	0
1 - Minor Errata	5.3.1	5.2.1 Catchment Area	Removed (Optional Caption) from A Wind-effect on Rain
1 - Minor Errata	6.1.1	6.1.1 E2 Objective	Set format as Block Quote
1 - Minor Errata	6.1.2	6.1.2 E2 Functional Requirement	Format as block Quote.
1 - Minor Errata	6.3	6.3 Related Topics	Changed link "Internal Moisture" to "Roof Ventilation.
2 - Editing and rearrangement	9.5.6	9.4.2.5 Sheetmetal Flashings on Corrugated Profiles	Revised and renamed clause.
1 - Minor Errata	14.5.1	14.23.1 Crest Fixing	Corrected minimum embedment into soft wood from 35mm to 30mm aligning with E2/AS1 and other reference in 3.12.1.3 Timber Purlins

2018 – November

19.12 2018 – November

The NZ Metal Roof and Wall Cladding Code Practice (COP), has been updated effective 1 November 2018.

In this Update no recommendations have been altered that would require changes to existing projects in progress

Summary of Changes in this Update

The previous External Moisture, Flashings and Penetrations sections have been updated to closer reflect the requirements of NZBC Clause E2 – External Moisture.
All clauses and sub-clauses in these sections have been substantially revised and drawings updated to show details more clearly.
- 6 External Moisture Overview gives a general introduction and overview of NZBC Clause E2 – External Moisture.
- 7 External Moisture Roofing discusses requirements for roof and wall cladding.
- 8 External Moisture Flashings deals with flashings, seals and laps.
- 9 External Moisture Penetrations recommends good practice for penetration design and installation.
Other updates consist of Category 1 – minor errata corrections to spelling, and grammar and layout.

19.12A

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
2 - Editing and rearrangement	4.5.2	4.5.2 Sea Spray	Moved copy dealing with corrosion from "Eaves Flashing" to "Sea Spray".
1 - Minor Errata	4.11.8	4.10.8 Microcracking	Correction to comparative scale of illustrations
0 - Clause Removed	6.1.1	7.1.1 Conduction
4 - Clause Inserted	6.1.1	6.1.1 E2 Objective	E2 Objective under NZBC Clause E2 (Extract)
4 - Clause Inserted	6.1.2	6.1.2 E2 Functional Requirement	New clause to follow E2 Objective.
4 - Clause Inserted	6.1.3	6.1.3 E2 Performance Requirements	New clause to follow "Functional Requirement".
0 - Clause Removed	6.1	7.1 Heat	Clause removed, see 7.3 Thermal Expansion And Contraction.
4 - Clause Inserted	6.1	6.1 NZBC Clause E2 External Moisture (Extract)	New Clause under External Moisture — General.
4 - Clause Inserted	6.2.1	6.2 Compliance	New 2nd level clause to follow "Acceptable Solution NZBC E2/AS1"
0 - Clause Removed	6.2.2.1	7.4.2.1 Profile Strength	Subject now discussed in 7.3 Thermal Expansion And Contraction.
2 - Editing and rearrangement	6.2.2.3	8.9 Flashing Expansion Details	Completely revised clause.
2 - Editing and rearrangement	6.2.2.4	8.9.2 Building Expansion Joints	Clause duplicated.
4 - Clause Inserted	6.2	6.2 Acceptable Solution NZBC E2/AS1	New 2nd level clause to follow "Limits on Applications. "
0 - Clause Removed	6.3	8.15 Sealing Washers
4 - Clause Inserted	6.3	6.3 Related Topics	New 1st level heading under "External Moisture — General"
3 - Substantial change to recommendation	6.5.2	7.1.2 Runoff	Clause completely revised.
0 - Clause Removed	6.5.3	7.2.3 Snow	Clause removed, combined with 5.4 Snow.
0 - Clause Removed	6.5.4	7.2.4 Hail	Clause removed combined with 5.4.1 Hail.
2 - Editing and rearrangement	6	6 External Moisture Overview	Clause completely revised to reflect all four COP clauses dealing with E2 External Moisture.
3 - Substantial change to recommendation	7.1.1	7.1.1 Minimum Roof Cladding Pitch	Clause completely revised.
0 - Clause Removed	7.1	7.1 Radiation
0 - Clause Removed	7.1	8.1 Purpose	Clause removed, included in 8 External Moisture Flashings.
2 - Editing and rearrangement	7.2.1	8.1.1 Flashing Durability	Completely revised and renamed clause renamed (previously "compatibility").
0 - Clause Removed	7.2	7.2 Convection
2 - Editing and rearrangement	7.2	7.1 Roof Pitch	Clause completely revised. To be the first sub-clause under External Moisture — Cladding.
2 - Editing and rearrangement	7.2	8.1 Flashing Materials	Completely revised clause
4 - Clause Inserted	7.2	7.2 Fastening Roofing	New sub-clause to be inserted at the end of Roof Pitch under External Moisture — Cladding.
3 - Substantial change to recommendation	7.3.1	7.3.1 Temperature Range	Completely Revised and rewritten. To follow "Thermal Expansion and Contraction" under the new level 1 Clause: "Cladding"
4 - Clause Inserted	7.3.1	8.3.1 Flashing Laps	Completely revised and shortened clause.
3 - Substantial change to recommendation	7.3.2	7.3.2 Roof Cladding Expansion Provisions	Completely Revised and Rewritten. To follow "Steel Cladding Temperature Ranges" in "Thermal expansion and Contraction" under new Level 1 Clause: "Cladding".
2 - Editing and rearrangement	7.3	7.3 Thermal Expansion And Contraction	Completely revised and redone. To be moved under new level 1 Clause: External Moisture Cladding.
0 - Clause Removed	7.4.1.1	8.6.1.1 Ridge - Hip Intersections	Clause incorporated into 8.4.1 Ridge And Hip.
2 - Editing and rearrangement	7.4.2	8.4.2 Barge And Verge	Completely revised clause.
0 - Clause Removed	7.4.2.1	8.6.2.1 Internal Barge Flashing	Incorporated into parent clause.
2 - Editing and rearrangement	7.4.2.2	8.4.2.1 Ridge – barge Intersections	Completely revised clause.
2 - Editing and rearrangement	7.4.4	8.4.4 Apron Flashings	Completely revised clause
2 - Editing and rearrangement	7.4.4.1	8.4.4.1 Parapet And Apron Capping Terminations	Completely revised clause.
2 - Editing and rearrangement	7.4.4.3	8.4.4.3 Step Apron	Completely revised clause. Drawings updated.
2 - Editing and rearrangement	7.4.4.4	8.4.4.4 Eaves Flashing	Completely revised and renamed clause. (Previously "Gutter Apron"). Drawing updated.
0 - Clause Removed	7.4.5	8.6.5 Valley Flashings	Clause removed. Valleys are discussed in "Roof Drainage".
2 - Editing and rearrangement	7.4.6	8.4.5 Curved Flashings	Completely revised clause.
2 - Editing and rearrangement	7.4.6.1	8.4.5.1 Lockseamed Flashings	Revised clause. Information added.
0 - Clause Removed	7.4.6.2	8.6.6.2 Jennied Flashings	Clause removed — all references to "jennying" has been removed from "Flashings".
4 - Clause Inserted	7.4.6.3	8.4.5.2 Crimped Flashings	New clause under 8.4.5 Curved Flashings.
0 - Clause Removed	7.4.7	8.6.7 Soffit Flashings	Clause removed.
2 - Editing and rearrangement	7.4	7.4 End Laps	Clause completely revised.
2 - Editing and rearrangement	7.4	8.4 Flashing Types	The last line edited.
0 - Clause Removed	7.5.1	8.12.1 Unpainted Metal Cladding	Clause removed.
0 - Clause Removed	7.5.2	8.12.2 Ventilation and Cavities	Clause removed.
0 - Clause Removed	7.5.3	8.12.3 Window and Door Flashings in Metal Cladding
0 - Clause Removed	7.5.4	8.12.4 Horizontal Metal Cladding
0 - Clause Removed	7.5.5	8.12.5 General Principles
0 - Clause Removed	7.5.6	8.12.6 Flush Window Flashings	Clause removed.
0 - Clause Removed	7.5.7	8.12.7 Recessed Window Flashings	Clause removed.
0 - Clause Removed	7.5.8	8.12.8 Butt Window Flashings	Clause removed.
0 - Clause Removed	7.5.9	8.12.9 Flashings For Vertical Cladding
0 - Clause Removed	7.5.10	8.12.10 Alternative Flashing Designs
2 - Editing and rearrangement	7.5	8.10 Metal Wall Cladding Flashings	Completely revised and renamed clause.
0 - Clause Removed	7.6	8.13 Flashings For Vertical Cladding	Clause removed.
0 - Clause Removed	7.7	8.14 Flashings For Horizontal Corrugate Cladding	Clause Removed.
2 - Editing and rearrangement	7.8.1	8.5.1 Primary Fasteners	Completely revised and shortened clause.
2 - Editing and rearrangement	7.8.2	8.5.2 Secondary Fasteners	Completely revised clause.
0 - Clause Removed	7.8.3	8.7.3 Secret Fixing Clips	Clause deleted.
2 - Editing and rearrangement	7.8.4	8.5.3 Flashing Cleats
4 - Clause Inserted	7.8.5	8.5.4 Seams	Split the drawing into eight individual drawings, for improved layout.
2 - Editing and rearrangement	7.8	8.5 Fastening Flashings	Clause renamed.
0 - Clause Removed	7.9.1	8.8.1 Properties	Clause removed. Discussed in 8.6 Sealants.
2 - Editing and rearrangement	7.9.2	8.6.1 Methods Of Sealing	Revised clause
2 - Editing and rearrangement	7.9.3	8.6.2 Surface Preparation	Clause shortened.
0 - Clause Removed	7.9.5	8.8.5 Sealed Laps	Clause removed see: A Sealed End Lap.
0 - Clause Removed	7.9.6	8.8.6 Strip Sealants	Clause removed.
0 - Clause Removed	7.9.7	8.8.7 Soldered Joints	Clause Removed.
2 - Editing and rearrangement	7.9	8.6 Sealants	Completely revised clause.
0 - Clause Removed	7.10.1	8.9.1 Vented Fillers
2 - Editing and rearrangement	7.10.2	8.7.1 Soft Edging	Revised and renamed clause.
2 - Editing and rearrangement	7	8 External Moisture Flashings	Completely revised clause.
4 - Clause Inserted	7	7 External Moisture Roofing	New Level 1 clause.
0 - Clause Removed	8.1	9.1 General	Clause removed. General discussion incorporated in the introduction.
2 - Editing and rearrangement	8.2.1	9.2 Additional Support	Completely revised and renamed clause.
2 - Editing and rearrangement	8.2.2	9.3 Penetration Durability and Compatibility	Completely revised and renamed clause.
0 - Clause Removed	8.2.3	9.5 Corrosion	Incorporated into "9.3 Penetration Durability and Compatibility".
0 - Clause Removed	8.2.4	9.5.1 Catchment	Clause removed.
0 - Clause Removed	8.2.5	9.5.2 Obstruction	Clause removed.
0 - Clause Removed	8.2.6	9.5.3 Discharge Capacity	Clause removed, see
0 - Clause Removed	8.2.7	9.5.4 Sealing	Clause removed. (Information is repeated in 8 External Moisture Flashings)
0 - Clause Removed	8.2.8	9.5.5 Alternative Materials	Clause removed, see 8.7.1 Soft Edging.
2 - Editing and rearrangement	8.2	8.2 Flashing Design	Completely revised and shortened clause
2 - Editing and rearrangement	8.2	9.1 Penetrations Minimum Pitch	Completely revised and renamed clause.
0 - Clause Removed	8.3.1	9.7.6 Nomenclature	Clause removed. More details added in 9.4 Penetration Design.
0 - Clause Removed	8.3.2	9.7.7 Diverter Or Cricket Designs	Clause removed in favour of more detailed drawings in Penetration Flashing Design.
0 - Clause Removed	8.3.3	9.7.8 Penetration Flashing Installation	Clause removed in favour of more detailed drawings in "Penetration Flashing Design".
0 - Clause Removed	8.3.4	9.7.9 Laps	Clause removed, see 7.4 End Laps.
0 - Clause Removed	8.3.5	9.7.10 Details	Clause removed. See 9.4.2.5 Sheetmetal Flashings on Corrugated Profiles.
0 - Clause Removed	8.3.7	9.7.11 Type A Soaker
0 - Clause Removed	8.3.8	9.7.12 Type B Watershed	Clause removed. New Details available.
0 - Clause Removed	8.3.9	9.7.13 Type C Tapered	Clause removed. New flashing details provided.
0 - Clause Removed	8.3.10	9.7.14 Type D Tray	Clause removed. New Flashing details provided elsewhere.
2 - Editing and rearrangement	8.3	8.3 Flashing Cover	Completely revised clause. Drawings updated for clarity.
2 - Editing and rearrangement	8.3	9.4 Penetration Design	Revised clause.
2 - Editing and rearrangement	8.4.1	9.5.2.1 Plant Room And Conduit Penetrations	Completely revised clause.
2 - Editing and rearrangement	8.4	8.3.2 Flashing Edges	Completely revised clause. Drawings updated.
2 - Editing and rearrangement	8.5.1	8.4.1 Ridge And Hip	Completely revised clause.
2 - Editing and rearrangement	8.5.3	8.4.3 Parapet Cappings	Completely revised clause.
3 - Substantial change to recommendation	8.5.4.2	8.4.4.2 Change Of Pitch	Completely revised clause. Drawings updated.
0 - Clause Removed	8.5	9.9 Dormer Junctions	Clause removed.
4 - Clause Inserted	8.7.3	8.6.3 Sealant Extrusion And Placement	Updated drawing: "Applying Sealant".
4 - Clause Inserted	8.8.2	8.7.2 Notched Edging	New Clause to follow "Soft Edging", under "Profile Closures".
2 - Editing and rearrangement	8.8	8.7 Profile Closures	Completely revised clause.
4 - Clause Inserted	8.9	8.8 Flashing Buckling	Inserted new clause.
4 - Clause Inserted	8.32	19.12 2018 – November	November Update Message added
2 - Editing and rearrangement	8	9 External Moisture Penetrations	Completely revised and renamed clause.
4 - Clause Inserted	9.3	9.2.1 Penetrations Safety	New sub-clause under "Additional Support".
4 - Clause Inserted	9.5.1	9.4 Penetration Positioning	New Clause.
4 - Clause Inserted	9.5.2	9.4.1 Sheetmetal Penetration Back Flashings	New Clause.
4 - Clause Inserted	9.5.3	9.4.1.1 Over-Flashed (Watershed) Back Flashings	New Clause
4 - Clause Inserted	9.5.4	9.4.1.2 Under-Soaker Back Flashings	New Clause
4 - Clause Inserted	9.5.5	9.4.2 Curb Design	New Level 2 Clause.
4 - Clause Inserted	9.5.5.1	9.4.2.1 Level Back Curbs	New level 3 Clause under 9.4.2 Curb Design.
4 - Clause Inserted	9.5.5.2	9.4.2.2 Arrowhead Back Curbs	New 3rd level clause under 9.4.2 Curb Design.
4 - Clause Inserted	9.5.5.3	9.4.2.3 Cricket Back Curbs	New level 3 Clause under 9.4.2 Curb Design.
2 - Editing and rearrangement	9.5.6	9.4.2.5 Sheetmetal Flashings on Corrugated Profiles	Revised and renamed clause.
4 - Clause Inserted	9.6.1	9.5.1 Boot Flashings to an Over Flashing	New Clause
4 - Clause Inserted	9.6.2	9.5.2 Other Applications for Boot Flashings	New Clause
4 - Clause Inserted	9.6.2.2	9.5.2.2 Mechanical Services	New clause
2 - Editing and rearrangement	9.6	9.5 Boot Flashings	Revised and renamed clause.
4 - Clause Inserted	9.7	9.5.3 Flush Penetrations	New clause
2 - Editing and rearrangement	16.7	17.7 Wind and Point Load Testing

2018 – October

19.13 2018 – October

The NZ Metal Roof and Wall Cladding Code Practice (COP), has been updated effective 1 October 2018.

Summary of Changes in this Update

In this update there are Category 1 - Minor Errata corrections only, for spelling and grammar - no clauses have been substantially revised, nor any recommendations altered.

19.13A Revision Detail - 2018 - October

Category	Clause Number (at time of update)	Clause (As of current publication)	Details
1 - Minor Errata	1.5.1	1.5.1 Mediation	1. Inserted "a" before settlement. 2.Corrected spelling of "available" in the second paragraph.
1 - Minor Errata	2.1	2.1 Definitions	General tidy up; Fix spelling: Intersection, surface, heights, dewpoint, six-sided, practitioners, seashore, rainwater, coatings, trademark, components, electromagnetic, skylight, sawtooth, embedded, cross-section, violently, stop end, fibreglass, change. Changed: Low Pitched 15° to 10°, and Pitch Roof 15° to 10°. Remove some extra spaces. Removed some commas. Inserted comma. Changed "newton" to "Newton". Reworked Pop Rivet definition. Removed semi-colon. UPdated "boot Flashings.
1 - Minor Errata	3.5.6	3.5.6 Section Properties	Moved paragraph: "Symmetrical corrugate or trapezoidal profiles have the advantage of being more easily curved around a radius. Because the ribs are necessarily close together, they have the disadvantage of roof traffic loads having to be spread over two crests or along the purlin line, and they have a lower run-off capacity."
1 - Minor Errata	3.5.8	3.5.8 Continuity	Updated Drawing. Arrows were not displaying correctly.
1 - Minor Errata	3.6.1	3.6.1 Point Load	Removed empty paragraph spacing
1 - Minor Errata	4.9.3	4.8.3 Graffiti Removal	Fixed typo "Grafitti"
1 - Minor Errata	4.10.3	4.9.4 Compatibility Table	Inserted "online" in the description of the online interactive tool.
1 - Minor Errata	4.11.6	4.10.6 Capillary Action	Typo — Changed 80 to 8°.
1 - Minor Errata	4.11.8	4.10.8 Microcracking	Replaced drawings a through to e
1 - Minor Errata	5.7	5.7 Downpipes	Replaced drawing "Collecting Rainwater"
1 - Minor Errata	6	6 External Moisture Overview	Fixed typo: "conductionand" to "conduction and"
1 - Minor Errata	9.3.3	10.12.1 Cold Roofs	fixed typo: inserted " is ..."
1 - Minor Errata	9.5	10.11 Underlay	1. Added new new photo – 9.5C Condensation on Synthetic Underlay. 2. Typo: corrected spelling of 9.5B "Condesation.." to "Condensation"
1 - Minor Errata	9.5.5	10.7.5 Non-Residential Buildings	Fixed typo: deleted extra "in"
1 - Minor Errata	10	11 Natural Light	Fixed typos: "thermal", "installation" and "available"
1 - Minor Errata	10.1	11.1 Clause G7 NZBC	Fixed typos: "through", "enough"
1 - Minor Errata	10.2	11.2 Natural Light Materials	Fixed typos: "a varying mass" and "square"
1 - Minor Errata	10.3	11.3 Types Of Roof Lights	Fixed typos: "single" and removed extra space after comma.
1 - Minor Errata	10.5	11.5 Weathering And Durability	Fixed typo: "not"
1 - Minor Errata	13.1.2	14.17 Turndowns (Drip Forming or Drip Edging)	changed "downturns" to "Turn-downs" and inserted "drip forming or drip edging" in the heading.
1 - Minor Errata	13.3.3	14.13.2 Screws	1. Fixed typos: "hardwoods", 2. Fixed broken links" "Fastener Performance" and "Secret Fixing Clips"
1 - Minor Errata	13.5.3	14.5.3 Expansion Fixings	Fixed link: "favourable conditions for expansion"
1 - Minor Errata	14.1.5	15.1.5 Purlin Spacing	Fixed typo: "subjected", removed comma.
1 - Minor Errata	14.4.2.4	15.4.2.4 Types Of Joints	Removed unnecessary link: (See drawing 11.2.4)
1 - Minor Errata	16.1.3	17.1.3 Resistance for wind pressures	Replaced incorrect numbering reference (section 15.7) with correct link (Wind and Point Load Testing)
1 - Minor Errata	16.2	17.2 Background to Scope	Corrected heading "Commentary on 16.1"
1 - Minor Errata	16.4	17.4 Commentary On 16.3	Corrected heading: "Commentary On 16.3"
1 - Minor Errata	16.9	17.9 Background to wind load testing	Corrected heading: "Commentary On Section 16.6"

Category	Description	Notification
Category 1 - Minor Errata	Correction to spelling, grammar or formatting that have no bearing on on the substance of the clause.	Recorded on website only - not individually included in emailed update
Category 2 - Editing and rearrangement	A clause or section of clauses has been rewritten to some extent for better articulation of the existing recommendation. Existing citations of the COP in project documentation may be less clear as a result, but recommendations are not altered.	Recorded on website, and will be cited in emailed update as either specific or summary information as appropriate.
Category 3 - Substantial change to recommendation	A substantial change in a specific recommendation of the COP has taken place. A review of existing project documentation against the new clause is considered essential.	Recorded on website, and explained with detail in emailed update

COP v3.0:revision-history;

Code of Practice v3.0 Online

19 Revision History

19A Revision Categories

19.1 2021 – September

19.1A

19.2 2021 – June

19.2A Revision Detail - 2021 - June

19.3 2021 – March

19.3A Capacity Calculators

19.3B Revision Detail - 2021 - March

19.4 2020 – December

19.4A Revision Detail - 2020 - December

19.5 2020 – September

19.5A Revision Detail - 2020 - September

19.6 2020 – June

19.6A Revision Detail - 2020 - June

19.7 2020 – March

19.7A Revision Detail - 2020 - March

19.8 2019 – December

19.8A Revision Detail - 2019 - December

19.9 2019 – August

19.9A Revision Detail - 2019 - August

19.10 2019 – May

19.10A Revision Detail - 2019 - May

19.11 2019 – February

19.12 2018 – November

Summary of Changes in this Update

19.12A

19.13 2018 – October

Summary of Changes in this Update

19.13A Revision Detail - 2018 - October