With the new changes to NZBC Clause H1, many designers are wondering the best way to specify a compliant membrane roof on a commercial project? As flat roof experts with over 55 years experience in the industry, we offer a system solution that make achieving H1 simple.
On the 3rd November 2022, MBIE made fundamental changes to Clause H1 which relates to energy efficiency and the thermal performance of roofing elements in particular insulation.
| Climate Zone | 1 | 2 | 3 | 4 | 5 | 6 |
| Was | R1.9 | R1.9 | R1.9 | R1.9 | R1.9 | R1.9 |
| Now | R3.5 | R4 | R5 | R5.4 | R6 | R7 |
The minimum roof R-Value has been increased in buildings over 300sqm and is shown in the above table. With these considerable changes, we have seen a significant increase in queries to our technical team via phone and email, as well as through the Live Chat function of our website. The queries all have a similar subject - how can we ensure we meet the new R-Values in our roof designs?
Nuralite have a solution that has been tried and tested in the market for over 15 years. Our CodeMark Certified Nuratherm Warm Roof system can ensure you meet and exceed H1 requirements.
| 0,022W/(m.K) | 50 | 60 | 70 | 80 | 100 | 120 | 140 | 150 | 160 |
| R- Value | R2.25 | R2.70 | R3.15 | R3.60 | R4.55 | R5.45 | R6.35 | R6.80 | R7.20 |
New Zealand Climate Zones
Our 80mm Enertherm PIR provides a continuous R-Value of 3.6 ‘outside the structure’ and when combined with our NPM900 metal tray substrate, we can provide an economical and fast, H1 compliant roof for Climate Zone 1.
If you require an H1 compliant roof in any of the 6 Climate Zones? We can increase or decrease the thickness of the Enertherm PIR to suit.
We aim to make the roof build up as efficient and effective as possible and it may be possible to include some lofted insulation inside the roof build up to reduce the amount of Enertherm PIR insulation overall.
The Nuratherm Warm Roof System can be specified with either Nuraply 3PM or Nuraply TPO. We can also undertake a Hygrothermal Analysis specific to your project and geographical location to ensure H1 requirements are met. You can view our interactive 3D Nuratherm Warm Roof model on Working Spec.
Please contact us if you would like assistance with your next project.
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Designing Roofs to Meet H1’s Increased Insulation Requirements
Low Carbon Design: Utilising Flat Roofs to Combat Carbon
System Solutions for Efficient Energy Use
Specifying an H1 Compliant Membrane Roof on a Commercial Project
Ballast Roofs/ Brown Roofs: An Alternative to Green Roofs
Utilising Passive House Principles in Warm Roof Design
Futureproofing Your Waterproofing Specification
The Ultimate Decking Solution: Windproof Nurajacks
Advantages of Membrane Roof Renewals
Why to Use Pre-Applied Membranes When Building on Brown Fields
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Taking Advantage of Roofs as Liveable Space
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