If you’re a builder, designer, architect, or homeowner working on a new home, don’t overlook the garage door in your NCC & NatHERS 7-star energy rating strategy. Since 1 October 2023, most states have begun enforcing the uplift to NCC 2022 minimum 7-star ratings for new homes, with NatHERS as the main compliance pathway. Factoring in compliant, tested garage door insulation early helps de-risk certification and avoid costly redesigns.
Under Australia’s National Construction Code (NCC 2022):
This is the same framework your energy assessor applies in performance modelling. This means including a tested garage door R-value can make the difference between reaching and not reaching 7-star targets – especially when margins are tight.
That’s where ThermaDoor Premium garage door insulation stands out.
ThermaDoor Premium is the only Australian garage door insulation brand that publishes dual-season, door assembly R-values -R1.48 (winter) / R1.43 (summer) – now a requirement under AS/NZS 4859.2:2018.
Thermal bridging makes garage doors a special case – see our detailed blog on Why Your Garage Door Has An R-Value of Zero – And How to Fix it
Australia’s original, and still the only purpose-built garage door insulation, designed for sectional and tilt doors and tested specifically for garage door conditions provides the best R-value for garage door insulation in Australia.
Read more about fire ratings and garage door insulation.
ThermaDoor Premium garage door insulation helps achieve NCC 2022 and NatHERS 7-Star outcomes. Select your role for specific guidance, including our dual-season door-assembly R-values (R1.48 winter / R1.43 summer) calculated to AS/NZS 4859.1 & 4859.2:2018.
Ask your architect or building designer to specify ThermaDoor Premium garage door insulation in the plans and specification schedule.
Confirm with your energy assessor that the garage door is modelled as bulk insulated using ThermaDoor’s declared R-values in the NatHERS assessment.
Request the official test report be included in the tender documents, so the builder and certifier lock in the energy outcome.
Choose between DIY kits or supply & install depending on your project needs.
Specify ThermaDoor Premium garage door insulation in the architectural drawings and specification schedule to ensure a compliant, purpose-built solution.
Avoid re-purposed wall or roof products, which can create performance gaps at certification.
Attach the test report to the design compliance set.
Model the garage door as bulk insulated using ThermaDoor Premium’s verified door-assembly R-values: R1.48 (winter) / R1.43 (summer) (calculated to AS/NZS 4859.1 & 4859.2:2018).
Incorporate ThermaDoor Premium into the NatHERS software model to reflect true thermal performance.
Reference the official test report in your compliance documentation.
Coordinate early with the energy assessor and designer so ThermaDoor Premium’s tested values are included in the approved compliance set.
Use installation practices that maintain the air gap, avoid gluing to the door skin, and ensure safe operation (including spring re-balancing where required).
Provide the Spec Pack and installation guide to site supervisors and trades.
If you require a copy of our official thermal test data we invite you to contact us.
At ThermaDoor we want you to do your own research and come back to us with the hard questions, and we have developed a Garage Door Insulation – Quick Buyer’s Checklist (Australia) to help you ask the correct questions when considering investing in garage door insulation.
Read Best R-Value for Garage Door Insulation Australia (Explained) to understand the context of these questions.
No. NCC 2022 and NatHERS require standard‑aligned inputs. Use garage‑door specific, tested values determined under AS/NZS 4859.1 & 4859.2 to avoid rating errors.
From thermal calculations performed by an independent thermal engineer in accordance with AS/NZS 4859.1 and R‑value determination per AS/NZS 4859.2, expressly for garage‑door conditions (reports available on request).
It can. The 7‑Star uplift places tighter budgets on heating/cooling loads; improving a large, conductive surface like the garage door often helps projects meet targets.
Yes. NCC 2022 Volume Two Part 13.2 requires insulation to comply with AS/NZS 4859.1 and uses AS/NZS 4859.2 for total/system R‑value calculations in relevant building‑fabric elements.
The material R-value only tells you the products R-value. It doesn’t give you the big picture of how well it insulates in a certain application for example a garage door. Due to the nature of a garage door – metal, air leakage, thermal bridging a garage door will more often reduce the material value quoted.
Got more questions? Read our Garage Door Insulation FAQ’s to learn about the original, and still the only purpose made garage door insulation in Australia
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