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.
The following revisions to the NZ Metal Roof and Wall Cladding Code of Practice were published on 1 December 2021.
Summary of Changes in this update:
- Update to 5A Capacity Calculations: These have now all been updated to require input of both 10 and 50 year ARI. This allows the calculators to automatically incorporate the correct ARI for the specifics of the project. Both values are retained when you select a different calculator or return for another project.
- Complete revision of clause 12.1 Roof Noise.
- Complete revision of clause 4.10.3 Solar Collectors and Other Roof Mounted Structures.
- Change of recommendation for 3.18 G550 Steel Cladding Fastening Pattern Tablesin Extra High Wind Zones. Recommendation amended from C2 pattern to C3.
The rest of this update comprises minor edits and fixes.
|Category||Clause Number (at time of update)||Clause (As of current publication)||Details|
|3 - Substantial change to recommendation||3.17.1||3.17.1 Corrugated Steel – 0.40||Drawing edited to change C2 recommendation to stay below Very High.|
|3 - Substantial change to recommendation||3.17.2||3.17.2 Corrugated Steel – 0.55||Changed recommendation for C2, to only be used below Very High Wind Zones.|
|3 - Substantial change to recommendation||4.10.3||4.10.3 Solar Collectors and Other Roof Mounted Structures||Clause has been completely revised.|
|3 - Substantial change to recommendation||8.8||8.8 Flashing Buckling||Changed recommended minimum moisture content to 12% following advice from Scion .|
|3 - Substantial change to recommendation||12.1||12.1 Roof Noise||This clause has been substatially revised. Some-subsections have been promoted to headings and some had been deleted a part of the revision.|
|4 - Clause Inserted||12.1.1 Wind Noise||New clause, raised and revised from former sub-sub clause of Roof Noise.|
|4 - Clause Inserted||12.1.2 Precipitation Noise||Newly created clause from the revised Roof Noise.|
|4 - Clause Inserted||12.1.3 Thermal Noise||New clause, information elevated from the revised Roof Noise.|
|4 - Clause Inserted||19.1 2021 – December||Revision message for the 1 December 2021 Update.|
|2 - Editing and rearrangement||1||1 Introduction||Update Revisions Message|
|2 - Editing and rearrangement||5.3.7||5.3.7 Gutter Capacity Calculator||All calculators now require input of both 50 year and 10 year ARI.|
|2 - Editing and rearrangement||5.4.7||5.4.7 Valley Capacity Calculator||All calculators now require input of both 50 year and 10 year ARI.|
|2 - Editing and rearrangement||5.6.3||5.6.3 Downpipe Capacity Calculator||All calculators now require input of both 50 year and 10 year ARI.|
|2 - Editing and rearrangement||5.7.1||5.7.1 Maximum Area Above Spreader Calculator||All calculators now require input of both 50 year and 10 year ARI.|
|2 - Editing and rearrangement||7.1.4||7.1.4 Maximum Run Calculator||All calculators now require input of both 50 year and 10 year ARI.|
|2 - Editing and rearrangement||9.4.4||9.4.4 Maximum Area Above Penetration Calculator||All calculators now require input of both 50 year and 10 year ARI.|
|1 - Minor Errata||1.3||1.3 Standards and Related Documents||Fixed column spacing.|
|1 - Minor Errata||2.1||2.1 Definitions||Clarified definitions for tray, trough, standing seam, and secret fixed profiles.|
|1 - Minor Errata||3.6.2||3.6.2 Roof Traffic||Changed "trademan" to trades people for gender neutrality.|
|1 - Minor Errata||3.18||3.18 G550 Steel Cladding Fastening Pattern Tables||Fixed grammar for consistency. Fixed drawings to show C2 fastening pattern.|
|2 - Editing and rearrangement||4.6.2||4.6.2 Environmental Guides||Envrinmental guides redone for improved display on all browers.|
|1 - Minor Errata||15.1||15.1 Curved Roofs||Grammar fix.|
|1 - Minor Errata||16.8||16.8 Overpainting||slight formatting change for improved reading.|