Australia's Original Purpose-Built Garage Door Insulation

DIY kits delivered Australia-wide.

Professional installation via our authorised distributor network.

Est. 2012

Australia's Original

Independently Tested

AS/NZS 4859.2:2018

Australian Made

Licence 7177

Purpose Built

For Garage Door Systems

Building to 7 stars? ThermaDoor is the only garage door insulation with the engineering documentation your energy assessor needs.

Is Your Garage Making Your Home Uncomfortable?

An uninsulated garage door is one of the largest unaddressed gaps in your home’s building envelope. In summer, it turns your garage into a 50°C heat trap — pushing heat into adjoining rooms, forcing your air conditioning to work harder, and making the space completely unusable. In winter, cold air floods in and settles through the floor into living areas. Most homeowners live with it for years before realising the fix takes a few hours and costs less than a week of running the air con.

Garage reaches 50°C+ in summer

Heat transfers directly into adjoining rooms and living areas

Cold, damp and unusable in winter

No insulation means no barrier between outside air and your home

Air conditioning and heating working overtime

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

See the Difference ThermaDoor Makes

Real installs. Real results. Read the full comparison.

Want to know more about foil products used as garage door insulation? Read our blog about why reflective foil fails as garage door insulation.

	Before ThermaDoor	After ThermaDoor
Summer temperature	Garage reaches 50°C+	Noticeably cooler — less heat into adjoining rooms
Winter comfort	Cold, damp, unusable space	Warmer and more usable year-round
Noise	Traffic and rain echoes through	Significantly reduced outside noise
Energy bills	Heat transfers into home, AC works harder	Reduced heat load on your cooling system
Insulation fit	Generic products that don’t fit properly	Purpose-built panels cut to your exact door
Installation	Complicated DIY with wrong materials	Simple DIY kit or professional supply & install

A Real Home. A Real Result.

When your garage is more than just a place to park the car, garage door insulation is not a luxury — it is a necessity.

For Deborah’s son, an NDIS participant, the garage is “The Cave” — a vital space for his independence and his support team. They had already invested in an epoxy floor and replastering to create something special. But the heat made it almost unusable.

The FLIR images below were taken on a completely ordinary autumn afternoon — outside temperature just 28°C. The uninsulated steel door was already radiating 44.7°C into the space. That is not a heatwave. That is a standard garage door making a mild day unbearable.

Learn how ThermaDoor’s insulated garage door panels work — and why the R-value difference matters.

“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, Mountain Creek — Google Review

ThermaDoor is Purpose Built. Not Repurposed.

Most products sold as garage door insulation were never designed for a garage door. They were designed for walls, or roofs, or building sites — then repackaged and sold as a garage door solution. They shift when the door moves. They separate in the heat. They stop working within a few years.

ThermaDoor was designed from scratch for a moving door system in the Australian climate. Every material choice has a reason.

The 35mm EPS core is what makes ThermaDoor garage door insulation that actually performs in Australian conditions — it will not soften or deform even when your door surface reaches 50°C in summer. A laminated foil backing — the same class of reflective material used to wrap houses during construction for thermal protection — manages moisture and reflects radiant heat back out before it can transfer through the panel. A UV-stable vinyl face protects the panel and keeps it looking clean year after year.

But the part that makes the real difference is how the three layers are joined. Rather than gluing materials together — which shifts and fails inside a moving door — ThermaDoor’s layers are factory-laminated under pressure into a single rigid panel. It moves with the door, holds its shape, and delivers verified R1.43/R1.39 performance year after year.

ThermaDoor is the only garage door insulation in Australia with independently verified assembly R-values — tested to AS/NZS 4859.2:2018.

See exactly how it works.

Comparing your options? Read how ThermaDoor compares to graphite polystyrene insulation and PIR foam board 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 man cave — ThermaDoor garage door insulation Australia — 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 — 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

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.

ThermaDoor — Get a Price for Your Door

Get an Instant Price for Your Door

Answer 4 quick questions — we'll tell you exactly which kit fits your door and what it costs.

Step 1: What brand is your garage door?

Your door brand determines the panel thickness required.

What is your panel thickness?

How do I measure my panel thickness?

How to measure panel thickness: Open your garage door and look at the edge of one of the door panels from the side. Use a tape measure or ruler to measure the thickness of the panel from the front face to the back face. This is your panel thickness. Most Steel-Line doors are either 30mm or 35mm.

Step 2: How many panels does your door have?

Count the individual panel sections across the full width of your door.

⚠ This door requires 2 kits. When you reach the shop, make sure you fill in both kit dropdowns with the correct size before adding to cart.

Step 3: Measure your panels

Measure every panel, then enter the largest measurement below.

⚠ Measure every panel before entering anything

Panels on the same door are often different sizes. If you only measure one panel and it turns out not to be the largest, your kit will be too small. Measure all panels first, then enter the longest length and largest height below.

Length of Largest Panel

Height of Largest Panel

Your price is ready

Based on your measurement

Kit price

—

✓ Inclusive of GST 🚚 Freight calculated at checkout

Order details

Door brand—

Panel count—

Largest panel measured—

Recommended kit size—

SKU—

Quantity to order—

ThermaDoor panels are trimmed to fit. Always cut panels to size during installation — never force an oversized panel.

🚚 Freight not included. Freight costs are calculated based on your delivery address and will be displayed at checkout in the shop. Most orders ship within 7 business days.

Before you order — confirm your shop selections

The shop dropdown defaults to a random size. Tick each item below to confirm you have changed it to the correct value.

I have selected door brand —

I have selected panel thickness —

I have selected panel size —

I have filled in both kit dropdowns in the shop 2 kits

🛒 Tick all boxes above to continue 📞 Get a Supply & Install Quote Instead

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 only purposed-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.

Not All Garage Door Insulation is Equal

Before you buy anything, know what to look for.

Most products sold as garage door insulation were never designed for a moving door system. They shift, separate, and lose performance within months. Our free Buyer’s Checklist gives you the five questions to ask before you spend a dollar — so you can compare any product, including ours, with confidence.

No email required. Instant download.

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.

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. Outsidedoor 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.

So, we installed the panels last night and I spent the day rearranging my garage storage. It was
a very hot day, so at on stage I thought to myself it might be cooler with the panel door open. I
was wrong, it was so noticeably cooler with the door closed, the insulation made a considerable
difference and made it comfortable to work with the door closed as compared to when there was
no insulation. Thank you, ThermaDoor Garage Door Insulation

Ready to Transform Your Garage?

Australia’s only purpose-built garage door insulation — independently tested, made to fit, built to last.

Available Australia-wide — DIY kits ship nationally · Professional installation available in most states

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.