COP v3.0:introduction

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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,, as Code of Practice Online (MRM COP Version 3).

The most recent Update to the COP was on 1 November 2018.

  • In this update Flashings and Penetrations have been updated to closer reflect good trade practice and the requirements of NZBC Clause E2 – External Moisture. The COP clause External Moisture has been split into External Moisture Overview and External Moisture Roof Cladding for purposes of clarity and objectivity.
  • All clause and sub-clauses in these sections have been substantially revised and drawings updated to show details more clearly. Wall cladding has been deleted subject to a comprehensive review at a later date.

Other updates consist of Category 1 – minor errata corrections to spelling, and grammar and layout.

See 19.1 2018 – November for details of the changes in this Update.