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External wall requirements for Class 1 buildings

The National Construction Code (NCC) sets out requirements for external walls in Class 1 and 10 buildings if they need to be fire-resisting. These requirements are set out in Volume Two of the NCC.
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This resource stipulates the construction requirements for external walls as per the NCC. It demonstrates that external walls (including gables) that are required to be fire-resisting must extend to the underside of a non-combustible roof covering or non-combustible eaves lining and must:  

  • have a Fire-Resistance Level of not less than 60/60/60 when tested from the outside, or  
  • be of masonry-veneer construction in which the external masonry veneer is not less than 90mm thick, or  
  • be of masonry construction not less than 90mm thick. 

Some concessions are available for non-habitable room windows and there are also separate provisions for carports in certain circumstances.  

Access this resource to gain an understanding of the provisions for external wall construction as set out in Part 3.7 of the NCC.  

Access this resource now

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Building Professionals

This resource is designed for builders and industry professionals who need to understand NCC requirements for external wall construction.

What does it include?

  • External walls of Class 1 Buildings
  • Construction requirements for external walls
  • Fire-Resistance Levels (FRL).

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