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Changes to branch drain connections

Changes have been made to the National Construction Code (NCC) 2022 that will require plumbers and builders to pay attention to the design and installation of branch drain connections for two-storey houses.
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If the sanitary draining system has not been installed with new regulatory changes in mind, plumbers and builders may find that the first-floor ceiling joists aren’t deep enough to allow for an added grade of pipe.  

The NCC 2022 accommodates changes to AS/NZS 3500.2:2021 Sanitary plumbing and drainage, which relate to junction connections where the main drain and the branch drain are both DN100mm. Under the new edition of the Standard, which will be adopted alongside NCC 2022, the entry level of the branch drain will need to be elevated at an incline of no less than 15 degrees above the horizontal. 

Provided in this resource is a table relating to how the change to the entry level will affect the depth of the main drain.  

Read this resource to find out how the changes to the Australian Standard and the NCC 2022 affect your designs and installations.  

Access this resource now

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Who is it for?

Building Professionals

This resource is designed for builders and industry professionals who want to understand changes in the NCC 2022 relating to sanitary plumbing and drainage.   

What does it include?

  • What the changes in the NCC 2022 are 
  • When the new requirements apply 
  • How the changes will affect drainage design 
  • What can be done when space is limited.  

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