Download COP V2.2

Download version 2.2 of the code of practice

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Although the information contained in this Code has been obtained from sources believed to be reliable, New Zealand Metal Roofing Manufacturers Inc. makes no warranties or representations of any kind (express or implied) with regard to the accuracy, adequacy, currency or completeness of the information, or that it is suitable for the intended use.
Compliance with this Code does not guarantee immunity from breach of any statutory requirements, the Building Code or relevant Standards. The final responsibility for the correct design and specification rests with the designer and for its satisfactory execution with the contractor.
While most data has been compiled from case histories, trade experience and testing, small changes in environment can produce marked differences in performance. The decision to use a particular material, and in what manner, is made at your own risk. The use of a particular material and method may therefore need to be modified to its intended end use and environment. New Zealand Metal Roofing Manufacturers Inc., its directors, officers or employees shall not be responsible for any direct, indirect or special loss or damage arising from, or as a consequence of, use of, or reliance upon, any information contained in this Code. New Zealand Metal Roofing Manufacturers Inc. expressly disclaims any liability which is based on, or arises out of, the information or any errors, omissions or misstatements.
No part of this Code may be reprinted or reproduced or utilised in any form or by any electronic, mechanical, or other means, including photocopying and recording, or in any information storage or retrieval system without permission in writing from the New Zealand Metal Roofing Manufacturers Inc, and acknowledgement of the source of the information.
This V2 Code is current as at 1 April 2008. New Zealand Metal Roofing Manufacturers Inc. periodically updates the information contained in this Code. Before using this Code, please refer to the New Zealand Metal Roofing Manufacturers Inc. website ( for the most recent updates on information contained in this Code.
This Code of Practice provides requirements, information and guidelines, to the Building Consent Authorities, the Building Certifier, Specifier, Designer, Licensed Building Practioner, Trade Trainee, Installer and the end user on the design, installation, performance, and transportation of all metal roof and wall cladding used in New Zealand.
The calculations and the details contained in this Code of Practice provide a means of complying with the performance provisions of the NZBC and also the requirements of the Health and Safety Act 1992.
The scope of this document includes all buildings covered by NZS 3604 and those designed and built under specific engineering design.
It has been written and compiled from proven performance and cites a standard of acceptable practice agreed between manufacturers and roofing contractors.
It is a major revision of the Profiled Metal Roofing Design and Installation Handbook printed in 1995, and supersedes it.
The drawings and requirements contained in this Code illustrate acceptable trade practice, but recommended or better trade practice is also quoted as being a preferred alternative. Because the environment and wind categories vary throughout New Zealand, acceptable trade practice must be altered accordingly, and in severe environments and high wind design load categories, the requirements of the NZBC will only be met by using specific detailing as described in this Code.
The purpose of this Code of Practice is to present both Acceptable Trade Practice and Recommended Trade Practice, in a user-friendly format in order to ensure that the roof and wall cladding, flashings, drainage accessories and fastenings:
- will comply with the requirements of B1, B2, E1 E2 and E3 of the NZBC;
- will comply with the design loading requirements of AS/NZS 1170 and NZS 3604 and with AS/NZS 1562;
- that the life of the roof sheeting and wall cladding, flashings, drainage accessories, roof lighting, and fastenings will be optimised;
- that the roof and wall cladding will be weathertight.

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