Australia's Original Purpose-Built Garage Door Insulation

A more comfortable garage starts with the door.

Actual FLIR images — sunny 28°C autumn afternoon
44.7°C uninsulated | 30.8°C with ThermaDoor installed
13.9°C cooler door surface

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

Minimal Weight Added

Composite Technology

Purpose Built for Garage Doors

Home

Is Your Garage Making Your Home Uncomfortable?

A bare steel garage door can become one of the largest uninsulated surfaces in your home. In summer, heat from the door can radiate into the garage and adjoining rooms. In winter, the garage can become cold and uncomfortable to use.ThermaDoor adds a purpose-built thermal barrier to the door, helping create a more comfortable garage and reducing the heat load on rooms beside it.

Hot garage in summer

Heat transfers directly into adjoining rooms and living areas

Cold, damp garage in winter

No insulation means no barrier between outside air and your home

Higher energy use

Every degree your garage gains or loses is energy your climate control system has to compensate for

Three Components. One Engineered System.

ThermaDoor is a composite assembly where each component has a specific role — and all three thermal components must work together to deliver the verified R-values.

When the sun heats your garage door, the steel skin conducts that heat inward. As it crosses the air gap, it radiates toward the panel. ThermaDoor’s sisalation foil reflects that radiant heat back across the gap before it reaches your garage. The high-density EPS core then absorbs and slows whatever conducted heat remains. The engineered air cavity — maintained by ThermaDoor’s purpose-made foam packers — is what allows the foil to function. Remove it, and the reflective component stops working.

The fourth component, the UV-stable vinyl facing, protects the EPS core and lamination bond from Australia’s harsh climate. It carries no thermal role — its job is to keep the system intact for the life of the door.

ThermaDoor coined the phrase “purpose-made garage door insulation” in 2012. Find out what the term actually means — and why it matters — in our latest article: Purpose-Made Garage Door Insulation in Australia.

Three thermal components. One protective layer. Verified R1.43 (winter) / R1.39 (summer).

High-Density EPS Core

Flame retardant, construction-grade expanded polystyrene foam is the primary insulator in every ThermaDoor panel. It slows conducted heat transfer through the door — keeping your garage significantly cooler in summer and warmer in winter, year after year. As the primary insulator in the composite system, it works in tandem with the foil and air cavity to deliver the verified assembly R-value.

Sisalation Foil Backing

Laminated to the back of every panel, this construction-grade foil reflects radiant heat back across the internal air cavity — the gap maintained by ThermaDoor's purpose-made foam packers. The foil only works because the gap is engineered. Together they form the reflective half of ThermaDoor's composite technology. The foil also acts as a Class 2 vapour barrier and achieves Group 1 fire performance classification — it's the same foil used to wrap Australian homes.

UV-Stable Vinyl Facing

The composite system only performs if the materials stay intact. This durable, flame retardant, UV-resistant vinyl facing protects the EPS core and lamination bond from Australia's harsh climate — resisting fading, cracking, and weathering year after year. The result is a clean, professional finish that holds its appearance and structural integrity for the life of the door.

See the Difference ThermaDoor Makes

Real installs. Real results. Read the full comparison.

Wondering why foil-only products fall short? Read our blog: Why Reflective Foil Fails as Garage Door Insulation.

Transform Your Garage Into a Year-Round Usable Space

Homeowners across Australia are converting their insulated garages into year-round living spaces.

Insulated garage converted into a home gym with ThermaDoor garage door insulation — Home Gym Garage Conversion

Garage home office with stable temperatures thanks to ThermaDoor insulation panels — Home Office Garage Conversion

Insulated garage used as a recreation room with pool table — Man Cave Garage Conversion

Hobby studio in insulated garage using ThermaDoor purpose-built insulation — Hobby Studio Garage Conversion

Children's playroom in insulated garage — comfortable year-round with ThermaDoor — Children's Playroom Garage Conversion

Pet room in temperature-controlled insulated garage with ThermaDoor panels — Pet Room Garage Conversion

Key Benefits of ThermaDoor Garage Door Insulation

Improved Comfort

Energy Efficiency

Protection & Durability

Noise Reduction

Home Value & Lifestyle

Safety & Compliance

ThermaDoor is the only garage door insulation product in Australia with a verified complete installed assembly R-value — and the only one with data your energy assessor can actually use. Learn more about garage door insulation and home energy ratings.

ThermaDoor — Who Is It For?

Whether you’re a homeowner looking to improve comfort or a trade professional specifying insulation solutions — ThermaDoor has you covered.

For Homeowners — Two Ways to Get ThermaDoor

WE DO IT FOR YOU

Supply & Install

Our own certified technicians service South East Queensland. For the rest of Australia, our authorised distributor network has you covered.

DO IT YOURSELF

DIY Kit

Everything you need to insulate your own garage door in a few hours. No special tools, no trades required. Our step-by-step guide walks you through the whole process.

Not sure if garage door insulation is right for you? Read why garage door insulation is worth it in Australia.

DIY Kit Pricing Guide

The prices below are a guide only. For your exact price including freight to your door, grab a tape measure and use our shop — it takes two minutes, no account needed, and you’ll know exactly what you’re up for before you commit to a thing.

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

* Prices include GST. Freight not included — calculated at checkout based on your postcode. No obligation to buy.

Most DIYers grab a tape measure and have their exact price in just a couple of minutes

Not ready to measure up just yet? Fill in our enquiry form — allow a few days during busy periods.

Read our How to Insulate Your Garage Door Yourself — DIY Guide

REAL CUSTOMER RESULT

Year-Round Garage Comfort

A more comfortable garage starts with the door. On a sunny 28°C autumn afternoon, Deborah’s west-facing garage door reached a surface temperature of 44.7°C.

With ThermaDoor garage door insulation installed, the same door measured 30.8°C in the same conditions, helping create a more comfortable, usable space throughout the year.

44.7°C

DOOR SURFACE TEMPERATURE

Before ThermaDoor

28°C

OUTSIDE AIR TEMPERATURE

30.8°C

DOOR SURFACE WITH THERMADOOR

After ThermaDoor

That is a 13.9°C reduction in garage door surface temperature, measured on an ordinary autumn afternoon.

“The temperature in the space has dropped by at least 20 degrees, which has completely transformed how we can use it. Since installing ThermaDoor, it has become a comfortable, functional, and genuinely enjoyable environment. It has opened up a whole new level of independence and capacity building for my son and his team. This has been one of the most impactful upgrades we’ve made to our home.”

⭐⭐⭐⭐⭐ Deborah Ross — Google Review

What Australian Homeowners Are Saying

Google reviews and direct customer feedback from across Australia

Hear it From a ThermaDoor Customer

“I’ve had it installed three times over 12 years. It was a no-brainer.”

Peter Harding, Hervey Bay – ThermaDoor customer for 12 years

Peter Harding from Hervey Bay shares his experience with ThermaDoor garage door insulation after having it installed three times over 12 years.

What Customers Tell Us Directly

Mark

I’m very happy with my garage door insulation, was an easy fit with simple instructions

Stephen, Queensland

Thanks again for your time. The difference your product has made is unbelievable. Outside door temp was 51 deg. Inside door temp was 30 deg.

David.

Wow, that came quick. Amazing! Easy to install. A couple of hours and all done!

Martin A Kelly.

We installed the ThermaDoor panels and I spent the next day rearranging my garage storage. It was a very hot day and I thought it might be cooler with the panel door open. I was wrong — it was so noticeably cooler with the door closed. The garage door insulation made a considerable difference and made it comfortable to work in.

Ready to make your garage more comfortable?

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

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

The Complete Garage Door System

ThermaDoor panels deliver R1.43 (winter) / R1.39 (summer) verified thermal performance across the door surface. But insulation alone is not enough. The gaps around the frame — top, sides, and floor — are where heat, cold air, dust, pests, smoke, and bushfire embers bypass the door entirely.

Cleverseal garage door seals close those gaps. Fitted to the interior face of the door opening, they reduce airflow into your garage by up to 96% — so your insulation can do what it was designed to do.

Together, the panels and seals create a complete thermal and weather barrier. The door insulated. The frame sealed. The system working as it should.

Learn more about ThermaDoor insulation

Learn more about garage door seals

For Trade & Industry

The Garage Door Insulation Used and Trusted by Industry Professionals

Designed by a licensed builder who couldn’t find a product that met real construction standards – so he built one. Australia’s original purpose-built garage door insulation with independently calculated assembly R-values and full technical documentation.

Tested & Certified

Independently tested to AS/NZS 4859.2:2018. Verified R-values you can specify with confidence.

Engineering Reports

Thermal documentation available for NatHERS compliance and energy assessments.

Trade Supply

Flexible supply arrangements for garage door businesses, builders, and installers across Australia.

Technical Support

Our team understands the technical requirements. We're here to help you specify the right solution.

ThermaDoor works with a select network of approved distributors and installation partners across Australia. We’re selective about who we partner with — because our reputation depends on every installation being done right. If you’re an established garage door business or trade professional who shares our commitment to quality, we’d like to hear from you.

Architects, builders and energy assessors can access full technical documentation, engineering reports and NatHERS compliance information in our Trade & Industry Hub.

BUYER’S CHECKLIST

What to Check Before Buying Garage Door Insulation

Choosing garage door insulation is about more than selecting a material. A well-designed system should support thermal performance, door operation and clear documentation.

ThermaDoor was developed by a licensed builder with more than 45 years’ construction industry experience. Our free checklist helps homeowners, builders and trade professionals compare garage door insulation products using the questions that matter.

Before you buy, check that they sytem:

Publishes clear R-values so you can compare insulation performance with confidence
States the R-value for an installed garage door assembly, rather than a raw material or wall-insulation figure.
Supports comfort in summer and winter, with thermal performance suited to changing conditions.
Maintains an effective air cavity so the insulation system can perform as intended.
Preserves door movement and spring balance through a fixing method suited to a moving garage door.
Provides relevant compliance documentation for building, renovation or energy-assessment requirements.

Garage Door Insulation — Frequently Asked Questions

Does garage door insulation actually work?

Yes. Garage door insulation works by creating a thermal barrier between the outside climate and your home. An uninsulated garage door acts like a giant radiator in summer and a freezer in winter. By fitting a purpose-built insulation system like ThermaDoor, you block the transfer of radiant heat and cold air. This keeps the garage significantly cooler on 50-degree summer days, stops heat from bleeding into adjoining living areas, and reduces the load on your home air conditioning system.

What is the best garage door insulation in Australia?

The best garage door insulation is a system engineered specifically for the weight and movement of a sectional garage door, with independently verified R-values. Repurposed wall insulation or generic foam boards often shift, break, or fail to provide measurable thermal benefits. ThermaDoor is Australia’s original purpose-built system. It features a three-layer laminated construction that moves with your door and delivers a verified assembly rating of R1.43 in winter and R1.39 in summer under AS/NZS 4859.2:2018.

Not sure how to compare products? Download our free Buyer’s Checklist before you spend a dollar.

How much does garage door insulation cost?

The cost of insulating a garage door depends on the size of your door and whether you install it yourself. A DIY ThermaDoor kit is a one-time investment that typically costs less than a single month of running your air conditioning to compensate for an uninsulated garage. Professional supply and install services are also available for homeowners who prefer to leave it to the experts. Because ThermaDoor is built to last the lifetime of your door, the upfront cost is quickly offset by long-term comfort and energy efficiency.

Get an instant, accurate price for your specific door using our interactive price tool.

Will garage door insulation fit my existing door?

Yes. ThermaDoor is designed to fit the four major Australian sectional garage door brands: B&D, Centurion, Gliderol, and Steel-Line. These four brands account for the vast majority of panel doors installed across the country. The kits are supplied with the correct panel thickness for your specific brand to ensure a perfect, secure fit. ThermaDoor is designed for sectional panel doors only and is not compatible with roller doors.

Can I install garage door insulation myself?

Yes. ThermaDoor DIY kits are designed specifically for homeowners to install in a few hours. You do not need any special tools, construction experience, or trades to complete the job. Every kit comes with comprehensive, step-by-step instructions. If you prefer not to do it yourself, ThermaDoor has a national network of authorised installers who can supply and fit the system for you.

What is an R-value and why does it matter for garage doors?

An R-value measures how well an insulation product resists heat flow. The higher the R-value, the better the insulation performs. However, many products only quote the R-value of the raw material, which is misleading. To know how the product will actually perform in your home, you need the assembly R-value. ThermaDoor is independently tested as a complete installed system, achieving a verified assembly rating of R1.43 (winter) and R1.39 (summer). This guarantees you are getting the thermal performance you paid for.

Make your garage a more comfortable space all year round.