Code of Practice Online
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 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:
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.
Newly updated sections will be available on the MRM website, www.metalroofing.org.nz/cop, as Code of Practice Online (MRM COP Version 3), and the rest is displayed as MRM COP Version 2.3 (a revised edition of V2.2 as published at November 2012).
Print options and downloadable illustrations are available from the MRM website, however, copyright remains with NZ Metal Roofing Manufacturers Inc.
The glossary section provides definitions and descriptions of commonly used terms, as well as illustrations of domestic cladding terminology, industrial cladding terminology, and profile geometry.
Load Design discusses design and installation elements to ensure roofs are structurally sound and meet the objectives for the NZBC B1 Structure.
Topics include:
Corrosion (B2-Durability) covers considerations for continued performance of roof and wall cladding over the building lifecycle.
Key topics include:
The Roof Drainage section coincides with the NZBC Clause E1 Surface Water. It describes how to drain rainwater from roofs quickly and effectively. Topics include:
The design and installation of metal roofing is greatly influenced by the laws of physics, which include the conductionand radiation of heat and the convection of air. Both designers and Roofing Contractors should be aware of thisinfluence. This section in the COP deals with:
This section contains acceptable and better flashing details for most possible junctions, but does not require the use of welting, seaming or crimping, which are used with flashing standing seam cladding. These techniques are described in Standing Seam Cladding, but they can be used to substitute any sealed lap in lieu of mechanical fastenings.
Flashings in this Code does not contain specific details of the interface with alternative roof cladding materials, such as butyl rubber, but the same good practice is applicable.
The science of internal moisture control is concerned with the need to manage and control condensation.
The condition of the outside environment, the building design, and occupant behaviour affect humidity in the living spaces, which ultimately affects humidity in the ceiling space.
This section of the COP focusses predominantly on managing humidity in the ceiling space of dwellings.
Shorter sections also cover the design of wall cladding. Non-residential roof and wall cladding may be affected by the need to control internal moisture.
Clear Roof Sheeting explores the materials and installationg methods availve to provide natural lighting solutions for buildings in NZ. Other topics include:
In addtion to Corrosion (NZBC: B2 – Durability), other issues which may affect the lifespan or perceived quality of metal roof and wall cladding, include:
Guidelines for site practice, including:
Metal roof and wall cladding should be installed as explained in this section to comply with the NZBC and to satisfy manufacturers' warranties.
To minimize the risk of wind damage to partially clad structures during construction, it is necessary to plan the sequence and method of cladding.
Other roofing products, include:
For this reason a commentary is provided which follows each part.
Section 15 is divided into general requirements and specific methods of testing sheet roof and wall cladding for point load and also to determine their resistance to wind pressures. (UDL - uniformly distributed load).
These procedures apply to all metals and plastic sheeting however because of their different characteristics some of the performance criteria are different.
Useful tools and tables to do calculations and conversions for roof and wall cladding. Just choose the correct online caculator, input your values, and get the answer.
This is a holding areas for deleted sections