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At Ecomax Homes, we are proud to bring over 10 years of BASIX experience and more than 7 years of NatHERS assessment expertise across residential projects throughout Australia.
A smart thermal wall solution for a three-storey duplex development in Seaford, NSW, achieving 7-Star NatHERS compliance while maintaining practical construction efficiency.
This Seaford, NSW project involved the energy assessment and compliance strategy for two premium three-storey duplex residences.
Due to the scale of the external wall areas and the vertical building design, achieving strong thermal performance under current Australian energy standards required a carefully engineered solution.
The objective was clear:
At EcoMax Homes, we focused on delivering a solution that balanced compliance, performance, and buildability.
For multi-storey duplex developments, wall performance becomes one of the most critical aspects of thermal efficiency.
Standard wall systems often struggle to provide sufficient insulation performance while still maintaining:
In projects like this, oversized wall systems can reduce usable internal space and complicate construction without delivering proportional performance benefits.
The client required a smarter and more efficient approach.
To address the project requirements, we recommended a double brick cavity wall system combined with Kingspan Kooltherm K8 Cavity Board insulation.
This high-performance insulation product delivered exceptional thermal performance while maintaining a slim wall profile.
Using only 25mm thickness, the insulation achieved approximately:
R≈2.2R \approx 2.2R≈2.2
within the cavity wall system.
This made it an ideal solution for projects where both space efficiency and high thermal performance were essential.
The upgraded wall system significantly enhanced thermal resistance, helping maintain more stable indoor temperatures throughout the year.
Benefits included:
The wall design played an important role in supporting the overall thermal modelling strategy required for:
This allowed the project team to meet performance targets without relying heavily on expensive glazing upgrades.
The solution also supported NSW BASIX thermal comfort requirements by improving the building envelope performance.
This streamlined the approval pathway and reduced the need for additional compliance adjustments later in the project.
Compared with bulkier insulation systems, the selected cavity insulation achieved strong results while maintaining a more compact wall assembly.
This helped preserve:
The selected wall system aligned perfectly with the premium nature of the duplex development.
It provided:
By combining smart material selection with detailed thermal modelling, the Seaford duplex project successfully progressed with a wall system that balanced:
The final design achieved strong thermal outcomes while avoiding unnecessarily complex or oversized construction systems.
For modern duplex developments, achieving 7-Star performance is not simply about adding more insulation—it is about selecting the right system for the building design.
Through careful thermal modelling and practical material selection, high-performance outcomes can be achieved without compromising:
Planning a duplex or multi-residential development in Sydney or NSW?
Our team can help you achieve high-performance energy compliance with smart, buildable, and cost-effective solutions.
We help builders, architects, developers, and homeowners achieve practical pathways to modern 7-Star homes across NSW.
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