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:

The rest of this update consisted of fixing minor errors and improvements for clarity.

Revision Detail - 2020 - December

CategoryClause Number (at time of update)Clause (As of current publication)Details
2 - Editing and rearrangement1Introduction Update Revisions Message
1 - Minor Errata1.3Standards and Related Documents Clause renamed.
1 - Minor Errata4.10.1Disimilar Metals Formatting fix.
1 - Minor Errata4.10.3Compatibility Table Removed reference to Butly Rubber into its own clause Compatibility with Non-Metallic Substances .
2 - Editing and rearrangement4.12Inert Catchment Inserted photo "Localised Damage due to Inert Catchment".
1 - Minor Errata5.2.4.6Asymmetrical Valleys Punctuation fix.
2 - Editing and rearrangement5.2.5Roof Drainage Capacity Clause renamed to more accurately reflect its content.
4 - Clause Inserted5.4.3Maximum Area Above Spreader Calculator New online tool for calculating maximum drainage areas for spreaders.
1 - Minor Errata5.5Gutter Installation and Maintenance Grammar fix.
2 - Editing and rearrangement5.6.3Rainfall Intensity Rainfall intensity maps have been added to this clause. Links to rainfall maps have been included in the calculators.
1 - Minor Errata5.6.3.2Allowance for Short-Term Intensities Updated short-term intensity multiplication factors.
2 - Editing and rearrangement5.7Gutter Capacity Calculations Renamed the clause. Other capacity calculators have been moved closer to the relevant information dealing with each topic.
0 - Clause Removed5.7.1North Island 50-year ARI, 10-minute Rainfall Intensity MapMap moved to Rainfall Intensity.
0 - Clause Removed5.7.2South Island 50-year ARI, 10-minute Rainfall Intensity MapMap moved to Rainfall Intensity.
3 - Substantial change to recommendation7.1.2Runoff Clause completely revised.
4 - Clause Inserted7.1.3Maximum Run Calculator New online tool to calculate maximum run for drainage of different roofing profiles.
2 - Editing and rearrangement8.4.4.4Eaves Flashing Inserted a paragraph recommending eaves flashings in Marine Environments.
1 - Minor Errata9.4.2Curb Design Introductory copy added.
4 - Clause Inserted9.4.4Maximum Area Above Penetration Calculator New online tool for calculating the maximum area above a penetration.
1 - Minor Errata17.2.3.1Site Testing Updated the graph.
4 - Clause Inserted 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 Valley Capacity Calculator New clause created for Valley Capacity Calculator. The calculator was previously part of Capacity Calculators.
4 - Clause Inserted Downpipe Capacity Calculator New clause for Downpipe Capacity Calculators.
4 - Clause Inserted 2020 – December New clause showing updates effective on 1 December 2020.
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Revision Category: 
4 - Clause Inserted
Revision Detail: 

New clause showing updates effective on 1 December 2020.