Garage Door Insulation & Home Energy Rating

The only garage door insulation in Australia with a verified complete installed assembly R-value — for new homes, existing homes, and every energy assessment in between.

The Standard for Garage Door Thermal Performance in Australia

Engineered composite insulation. Independently verified R-values. Built specifically for the mechanics of your garage door.

Est. 2012

Australia's Original System

Verified R-Values

R1.43 Winter / R1.39 Summer

Australian Made

Licence 7177

Lightweight

About 7kg - Double Door

Composite Technology

Purpose Built for Garage Doors

Product Warranty

Core: life of door · Vinyl & Foil: 7 years

Home Garage Door Insulation and Home Energy Rating

Why the Garage Door Matters in a Home Energy Rating

ThermaDoor provides verified home energy rating garage door insulation data — assembly R-values that support accurate assessments for new and existing Australian homes.

As Home Energy Rating conversations become central to Australian housing, the garage door requires specific attention. In attached homes, homes with rooms above the garage, or garages connected to internal living areas, the garage door is often the largest moving surface in the building envelope.

Whether you are designing a new home to meet the 7-star National Construction Code (NCC) minimum or looking to improve the energy rating and comfort of your existing home, the thermal performance of the garage door plays a critical role.

A garage door is not a solid wall. It is a moving assembly of steel panels, hinges, tracks and joins — and this is why material-only R-values are insufficient for accurate energy assessments. ThermaDoor is the only purpose-made garage door insulation product in Australia, and the only product with a verified complete installed garage door assembly R-value — R1.43 winter and R1.39 summer, tested under AS/NZS 4859.1:2018 and AS/NZS 4859.2:2018.

This gives homeowners, builders, designers and assessors a reliable, independently verified basis for including the garage door in any Home Energy Rating discussion.

The Australian Government’s Home Energy Rating website provides accredited assessors for both new and existing homes.

Choose Your Pathway

Building a New Home or Renovating?

Specify ThermaDoor to support NCC compliance and 7-star Star Rating requirements. Access engineering reports and assessor documentation.

Upgrading an Existing Home?

Improve your home’s energy performance, reduce energy bills, and increase the comfort of rooms adjoining the garage — and document the upgrade for future sale or rental.

ThermaDoor R-values are Based on Verified Installed Assembly Data

Not all garage door insulation R-value claims are supported in the same way. Some products quote only the R-value of the insulation material, some provide no R-value claim at all, and some claim a total or installed R-value without showing clear tested evidence for the complete installed garage door assembly.

Before relying on any claimed R-value, homeowners, builders, designers and energy assessors should ask one simple question: where is the data? A claimed installed R-value should be supported by appropriate test documentation, not just marketing language, assumptions or material-only figures.

This matters because a real garage door is not just a flat sheet of insulation. It includes steel skins, hinges, joins, panel edges, tracks, air gaps and other elements that can contribute to thermal bridging. Unless those elements are considered, the claimed figure may not reflect the performance of the garage door once installed.

ThermaDoor provides verified complete installed garage door assembly R-values of R1.43 winter and R1.39 summer, tested under the relevant Australian Standards, including AS/NZS 4859.1:2018 and AS/NZS 4859.2:2018. This gives homeowners and project professionals documented data they can refer to when discussing garage door insulation in a broader Home Energy Rating, NatHERS, renovation or specification context.

Verified Assembly R-Values for Home Energy Rating Assessments

A key difference with ThermaDoor garage door insulation is that its R-value claims are not based on insulation material alone. Garage doors are moving assemblies made up of panels, metal skins, hinges, joins, tracks and operating hardware. These parts can all affect thermal performance, which is why a material-only R-value does not properly describe how an insulated garage door performs once installed.

ThermaDoor has verified complete installed garage door assembly R-values of R1.43 winter and R1.39 summer, tested under AS/NZS 4859.1:2018 and AS/NZS 4859.2:2018. These figures apply to the installed garage door assembly, not just the insulation panel by itself.

That distinction matters. It gives homeowners, builders, designers and assessors a more reliable basis for discussing garage door insulation in renovation, specification and Home Energy Rating contexts, particularly where evidence-backed product data is required.

Read more about the importance of Total system R-values and the National Construction Code

Useful Links and Documentation

Key documentation and resources for homeowners, builders, designers and assessors considering ThermaDoor in a Home Energy Rating, NatHERS or new-build context.

Product Page Thermal Report Buyer’s Checklist Trade Hub

What ThermaDoor Does Not Claim

ThermaDoor does not guarantee a better Home Energy Rating, NatHERS result or energy-efficiency outcome on its own. A home assessment depends on the whole building, including orientation, glazing, wall and ceiling insulation, ventilation, sealing, shading, climate zone and other design factors.

What ThermaDoor provides is a purpose-made garage door insulation system with verified installed garage door assembly performance. That gives homeowners and project professionals clearer documentation when the garage door is part of a wider energy-performance, renovation, new-build or comfort discussion.

This honest distinction is important. ThermaDoor should be treated as one documented component in the broader home performance conversation, not as a standalone rating solution.

Garage Door Insulation & Home Energy Rating — Common Questions

What is a Home Energy Rating?

A Home Energy Rating is an assessment of a home’s energy efficiency. For new homes, it estimates expected energy use based on design plans to ensure compliance with the National Construction Code. For existing homes, it assesses current performance and identifies areas for improvement. The assessment produces a Star Rating (measuring the building fabric) and a Whole of Home rating (including appliances and solar).

Why does the garage door matter in a Home Energy Rating?

In homes where the garage is attached to living areas or sits below occupied rooms, the garage door is a massive thermal bridge. An uninsulated steel door transfers significant heat. Including a verified insulated garage door assembly in the assessment can improve the overall thermal performance of the building envelope.

What is the difference between an assembly R-value and a material R-value?

A material R-value only measures the insulation product itself in isolation. An assembly R-value measures the entire structure as it is installed in the real world — including the steel door panels, hinges, gaps, and the insulation. Because garage doors have significant thermal bridging, only an assembly R-value provides accurate data for a Home Energy Rating.

Can ThermaDoor data be used by energy assessors?

Yes. ThermaDoor provides an independent engineering report detailing the complete installed garage door assembly R-values (R1.43 winter / R1.39 summer) tested to AS/NZS 4859.1/.2:2018. Assessors can use this verified data as a custom input in their accredited software.

Make your garage a more comfortable space all year round.

Get exact DIY pricing online or find professional installation near you.

DIY kits ship Australia-wide · Professional installation available through authorised distributors

Door Size	Panels	Price (from)
Single Door	8 panels	From $330
Single Door (Large)	10 panels	From $380
Double Door	16 panels	From $660
Double Door (Large)	20 panels	From $760