We’re pleased to update you on the extensive work NASH has undertaken regarding the H1 energy efficiency requirements. On behalf of our members, we submitted a formal proposal advocating for practical, effective, and industry-appropriate regulations.
Our submission was driven by data, collaboration, and a commitment to fair outcomes for steel-framed construction.
Key Highlights of Our Submission
✅ Framing Percentage Adjustments – We challenged the assumption that all framing systems use 38% of wall area, demonstrating that light gauge steel (LGS) averages only 24.15%. This ensures LGS is fairly evaluated in thermal calculations.
✅ Improved Compliance Pathways – We pushed for advanced energy modelling and a streamlined Calculation Method to enable accurate assessments without unnecessary complexity.
✅ Response Surface Methodology (RSM) Integration – We proposed using RSM, a statistical modelling tool that optimizes complex variables, to provide a more precise, data-driven approach to evaluating thermal performance.
✅ Thermal Performance Recognition – We reinforced that LGS already integrates effective thermal break technologies, helping to minimize thermal bridging.
✅ Practical Transition Periods – We advocated for a structured phase-out of outdated compliance methods while allowing the industry time to adapt.
✅ Advancing Sustainable Building Practices – Our submission emphasized aligning insulation regulations with modern, performance-based design standards to support efficient and sustainable construction.
Collaboration & Industry Leadership
This submission was a collaborative effort, and we’d like to acknowledge Yazeed Al-Radhi and Alistair Flemmingfor their dedication. They worked closely with regulators, industry groups, and technical experts to ensure our members’ perspectives were well represented.
Their efforts have been instrumental in shaping a submission that balances regulatory requirements with real-world construction practices.
Recent Progress & Upcoming Actions
At the H1 Achieving International Performance meeting on March 6, 2025, several key updates were shared:
📌 Final Report Drafting – Yazeed is drafting the final report covering construction, thermal modelling, and frame performance. Submission is scheduled for the end of March, followed by a two-week review period by BRANZ and our members.
📌 WuFi Modelling Research – In collaboration with BRANZ, Yazeed and Alistair are finalizing the scope of a WuFi modelling research program. This Phase 3 study will further refine our understanding of insulation performance.
📌 Cladding & Connection Details – Work is underway to clarify best practices for connecting cladding systems to steel frames.
📌 Floor Systems Review – A review of floor systems, including deep C joists and insulation placement, is in progress to optimize design and connection details. Yazeed is coordinating a site visit for further assessment.
📌 International Recognition – The H1 Achieving International Performance project has gained global attention,with government organizations outside New Zealand reaching out—an exciting validation of our work.
Next Steps
We will continue to keep you informed as the consultation process and technical developments progress. If you have any questions or need further details on how these updates may impact your projects, please feel free to reach out to our team.
Thank you for your ongoing support as we continue advancing steel-framed construction together.