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 NZ Metal Roof and Wall Cladding Code of Practice (COP) is published by NZ Metal Roofing Manufacturers Inc. (MRM), to provide:
- acceptable trade practice for the fixing of metal roof and wall cladding and accessories.
- prescriptive detailing for designers and sets a benchmark for the standard of detailing and workmanship required over and above that required to comply with the NZBC.
The COP does not describe or dismiss alternative methods, which may need specific acceptance by the Building Consent Authorities.
It is published in accordance with current technology, materials, and building codes. The COP will be periodically updated to reflect changes in legislation and standards or improvements in technology and available materials.
The most current Code of Practice is available on the MRM website, www.metalroofing.org.nz/cop, as Code of Practice Online (MRM COP Version 3).
The most recent Update to the COP was on 1 December 2019.
- 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 5.7 Capacity Calculations.
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 5.7 Capacity Calculations.
- New clauses have been added for 17.3.2 Point Load Testing and 17.1.2 Point Load Testing Standard under 17 Structural Testing.
- The Glossary has been updated with 2.1 Definitions for Swiss Gable, Finial, and Profiled Washer; and some minor edits to refine definitions and grammar fixes.
See 19.1 2019 – December for details of the changes in this Update.