UNDER CONSTRUCTION

R-Value

Green Roof

Green Roof Gardens are popular for city roofs, offering insulation, reducing temperatures, improving air quality, and providing outdoor space. Extruded Polystyrene beneath soil acts as an effective thermal barrier, supporting walkways and heavy loads without degradation or water absorption. Austech offers high-strength options for various needs.

PRMA

Protected Roof Membrane Assembly (PRMA) uses Foamular Extruded Polystyrene Insulation over waterproof membranes, shielding them and creating a continuous thermal barrier. Secured with ballast like gravel or pavers, it offers a simple, effective way to insulate and protect concrete roofs while maintaining waterproof integrity.

Cold Storage

Cold storage environments are extremely harsh, with cold temperatures, high moisture, and heavy loads. Foamular Extruded Polystyrene Insulation is widely used in cold storage, from small cool rooms to large facilities like Rand Cold Storage. It consistently outperforms other insulations in maintaining performance and supporting heavy loads.

Commercial & Residential

Foamular insulates under concrete slabs, reducing temperature fluctuations and improving energy efficiency. Its high R-values in small thicknesses save space, ideal for retrofits. Durable and versatile, Foamular maintains performance for 20 years, making it a cost-effective solution that enhances modern large-scale construction.

Wine Cellar Insulation

Foamular extruded polystyrene insulation is ideal for wine cellars, resisting moisture and reducing temperature fluctuations. Its high R-values lower energy costs, while its water resistance and compatibility with various finishes make it perfect for retrofits and protecting delicate storage environments.

Concrete Sandwich Panels

Extruded Polystyrene enhances masonry and concrete walls by creating insulated panels during casting, improving thermal performance. Austech’s non-conductive ties minimize thermal bridging, making panels energy-efficient. Just 50mm of Foamular offers R1.78, significantly boosting insulation compared to brick or concrete, ideal for faster, better-performing construction.

Model Making

Foamular insulation under concrete slabs enhances energy efficiency by creating a thermal barrier, reducing temperature fluctuations. Its high R-values in small thicknesses save space, ideal for retrofits. With strong tensile strength and long-term performance guarantees, Foamular is a durable, cost-effective choice for commercial and residential underground insulation.

Floor Heating

Foamular under-slab insulation creates a thermal barrier, reducing heat loss and energy demand in in-slab heating systems. It extends system life, maintains properties for 20 years, and withstands moisture and soil. This leads to lower operating costs, energy savings, and reduced greenhouse gas emissions.

Lightweight Construction

Extruded Polystyrene with render offers a lightweight, efficient insulation solution for brick and masonry facades. It provides a continuous thermal barrier, improves energy efficiency up to 30%, and is easy to install without drying time. Foamular enhances renovation and extension projects, reducing thermal bridging and maintaining long-term performance.

Stella RX

Stella RX insulation’s R-value is based on real-time ageing and the product is warranted to maintain 90% of its insulating value for twenty years. Stella RX insulation has a combination of characteristics that yield very low water absorption and is available in a range of compressive strengths that accept loads up to their design limit with little deformation.

Insulation performance you can trust

FAQ - Frequently Asked Questions & Downloads

What is Stella RX?

Stella RX is a closed-cell extruded polystyrene insulation board.

What sort of projects can Stella RX be utilised on?

Stella RX has a range of applications, from insulating commercial roofs, also insulating under house slabs.

what is the difference between extruded and expanded polystyrene?

Expanded polystyrene (EPS) is beads of polystyrene expanded by steam into blocks that are then cut into boards. This process leaves air gaps between the beads that absorb moisture which lessens thermal and physical performance.
Extruded polystyrene is a closed-cell material with higher compressive strengths, R-values and moisture resistance than any grade of EPS. View the Extruded V's Expanded.

What is R-Value?

R-value is a measure of thermal resistance used frequently in the construction industry and is the standard for measuring insulations effectiveness.

What are Stella RX advantages?

Stella RX closed-cell construction gives it many advantages over expanded polystyrene such as:

Higher R-value per thickness
No physical or thermal loss through moisture absorption
Higher impact resistance
A twenty-year warranty

What are The "R-Values" of Stella RX?

50mm = R1.78
75mm = R2.67
100mm = R3.56

Why do some other products have much higher R-Values?

Generally, they don't. Many products falsely use the American system, not the Australian system, which has R-value ratings around 6 times greater than the Australian standard. So an R-value of R6.0 in America is around R1.0 in Australia.
Austech also uses the Australian standard temperature of 24°C, but if you use a smaller temperature, you get a greater R-value. For instance, 50mm of Stella RX has an R-value of R1.78 at 24°C but at minus 30°C this jumps to R2.22. If you are having difficulty understanding R-values, contact our technical assistants here.

Is Stella RX affected by termites?

No. Stella RX is not a food source for ants or termites but they may use it as a path to a food source. Standard termite protection processes should be used as with any other building materials.

Is Stella RX fire rated?

Stella RX has the following fire rated indices:

Fire-rated indices as1530.3
Ignitability 9 (0-20)
Spread of flames 6 (0-10)
Heat evolved 6 (0-10)
smoke developed 8 (0-10)

What sizes and thicknesses are available?

Stella RX comes in various thicknesses, from 25mm up to 100mm. layers can be combines to reach desired R-value.

The standard board size are:

2050 x 600 with a shiplap edge on the long sides plus Stella RX 50mm is also available in 2400 x 1200.

Can i go and visit some projects that use Stella RX?

Yes, try our case studies for projects that have used our products, or contact us and we can recommend one in your area. Generally, Extruded polystyrene is placed below a layer of finishing products, like ballast or render, so you rarely get to see it.

How do I fix extruded polystyrene to my substrate?

This depends greatly on your application. When used as concrete roof insulation Extruded Polystyrene can be held in place with simple ballast, while we can provide specially designed washers for lightweight construction and high strength pins for precast insulation. Contact our technical advisors for fixing recommendations.

Environmental strategy

Extruded Polystyrene insulation is an inherently green product. Insulation is designed to limit thermal fluctuations, reducing the need for artificial temperature controls, and in turn the need for electricity and fossil fuels. Stella RX estimates that each year their range of insulation eliminates over 1 Billion tonnes of greenhouse gas emissions - equal to the annual emissions of 200 million passenger cars or two billion barrels of oil. Owens Corning doesn't just rely on their insulation to save the environment. Owens Corning's constant effort to reduce their environmental impact earned them 56th place in Newsweek's 2010 top 500 greenest American companies, ahead of American Express, Apple and Ford Motors. Owens Corning has also set targets to reduce its GHG Emissions, Energy Consumption, Particle Matter, Nitrogen Oxides, Waste to Landfill and Water Consumption.

Are you looking for technical data, and case studies? You can download them here.

Extruded polystyrene has you covered

Durability, reusability, moisture resistance, and the ability to retain R-value in the presence of water enables Stella RX XPS insulation to be used in a wide variety of building applications from roof insulation to below-grade use where the insulation will be in constant contact with moisture.

PRMA insulation is placed directly over the waterproof membrane, providing protection for the membrane and also creating a continuous thermal barrier on the roof. Stella RX is held in place with a specified ballast, usually gravel or concrete pavers.

Good insulation pays for itself

Stella RX high compressive strength means it can easily be walked on once the specified ballast has been installed. This creates an easy space for maintenance crews to access the roof, but can also help create rooftop recreation areas, adding an extra usable space to the building and increasing urban public space. Extruded Polystyrene Insulation requires no additional waterproofing and can easily cope with regular water immersion making it ideal for retro-fitting on older buildings.

Are you looking for technical data, and case studies?
You can download them here.

Email us with your project plans, so we can guide you through our collection of technical data, scientific journals and manuals.

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