Code of Practice for Roofing

This NZ Metal Roof and Wall Cladding Code of Practice is published by the NZ Metal Roofing Manufacturers Inc., to provide prescriptive acceptable trade practice for the fixing of metal roof and wall cladding and accessories. In addition it provides prescriptive detailing for designers and sets a benchmark for the standard of detailing and workmanship required over and above that required deemed to comply with the NZBC.

The Code is divided into four parts:

The performance requirements, and the prescriptive means to comply with this Code of Practice are printed in black bold font and blue shaded. They are summarized in section 17 the Appendix.
The 'What' and the 'How'.
The first part is normative, i.e. compliance is mandatory to comply with this Code of Practice and the word 'must' is used.
The recommended better practice options and the responsibilities of different parties to comply are printed in black - the 'Should know' and 'Should do's'.
The second part is not mandatory but describes better options or alternatives. They are described by the words 'should', 'recommend', 'preferred' and 'may'.
The reasoning used to formulate the above is printed in blue
-the 'Why'.
The third part is informative, i.e. it is for information and reference.
Please ensure that materials should be kept dry before installation. Please also note that it should not be assumed that because the cladding/purlins will be eventually installed out in the weather, therefore protection is not required. Dry storage is required at all times. Poor storage could result in spoiling the surface appearance & severely reducing service life of the product.

Guide to Avoid Wet Storage Stain

NZMRM Code of Practice v3.3 2022