The introduction of NCC 2022 marks the most significant change to Australian building energy efficiency standards in over a decade. For architects, engineers, and building professionals working on Class 2-9 commercial buildings, the updates to Section J (Volume One) introduce rigorous, quantifiable requirements for building envelope integrity.
Airtightness is no longer just “good practice” – it is now a mandatory performance requirement with clear compliance pathways. This blog post breaks down exactly what you need to know about the new mandates and how they impact your design and documentation process.
This guide breaks down the technical nuances of the ISO 14644 framework to ensure your next project is certified, compliant, and high-performing.
The National Construction Code (NCC) 2022 Section J has fundamentally shifted how energy efficiency is achieved in Australian buildings.
It is no longer enough to rely on insulation alone.
Uncontrolled air leakage is now one of the biggest threats to compliance.
For architects, engineers, and developers, this means:
If your building leaks air, it leaks energy and that directly impacts your ability to meet NCC compliance.
Before physical testing is even considered, the DTS pathway specifies non-negotiable construction details that must be implemented during the build process. These are the prescriptive measures detailed in Part J5D7:
This is the most robust way to ensure compliance and is increasingly preferred for complex designs.
If a formal blower door test is not conducted, the builder must provide comprehensive “Evidence of suitability” to the building certifier.
This requires a rigorous inspection and documentation regime throughout construction, proving that every prescriptive requirement of Part J5D7 has been met and that all fabric junctions are continuously sealed.
This requires meticulous documentation of prescriptive sealing measures, including:
Airtightness doesn’t stop at the walls. NCC 2022 Section J also emphasizes two often-overlooked areas:
Across Australia, common targets include:
The tighter the building, the lower the energy demand and the easier compliance becomes.
Waiting until the end of a project to address airtightness is a high-risk strategy. If a building fails a JV4 test after internal linings are installed, rectifying leaks is cost-prohibitive.
Strategies for Success:
At Aerotight, we work alongside architects, builders, and developers to deliver customised window furnishing solutions that actively support energy efficiency outcomes.
We don’t just supply blinds or curtains—we help improve:
Particularly for projects targeting:
As energy costs rise and government projects demand measurable outcomes, airtightness has become a core performance metric.
Whether you are targeting NABERS ratings, Green Star certification, or standard NCC compliance, getting the details right at the design stage is non-negotiable.
Need airtightness testing for compliance or project verification? Submit the form and our team will reach out to you shortly.
