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Understanding R-Value: Your Key to Effective Perth Home Insulation

Insulation Extract | Trusted by over 10,000 Aussie Home Owners

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At Insulation Extract, we believe that having a well-insulated home is the key to year-round comfort and substantial energy savings.

Understanding the R-Value of thermal insulation is crucial in making informed decisions about the right insulation products for your home. In this comprehensive guide, we will delve into the concept of R-Value, its significance, how it's calculated, and the best practices for choosing and upgrading insulation to maximize thermal efficiency in your home.


What is R-Value and Why is it Important?

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R-Value is a measure of thermal insulation's resistance to heat transfer. Simply put, the higher the R-Value, the more effective the insulation is at preventing heat flow. This translates to less heat loss during winter, reduced heat gain during summer, and ultimately, substantial savings on your energy bills year-round.


The importance of R-Value lies in its direct impact on the insulation's performance. No matter which insulation brand or material you choose, if you don't select the appropriate R-Value for your home, you won't fully reap the benefits of insulation.

How is R-Value Calculated?

R-Value is determined by two primary factors: the thickness of the insulation product and its thermal conductivity.


The formula for calculating R-Value is as follows:

R-Value = Thickness (m) / Thermal Conductivity (W/mK)

In practical terms, a thicker insulation product with low thermal conductivity will have a higher R-Value, indicating superior insulating properties.


Choosing the Right R-Value for Your Home

Selecting the appropriate R-Value for your insulation is crucial to ensure maximum efficiency and comfort in your home. Approximately 35% of heat loss is through ceilings, and 25% through walls. The recommended R-Value depends on your geographic location and home design.

This ensures efficient heat regulation in milder climates.If you're uncertain about the right R-Value for your location, our insulation specialists at Insulation Extract are always ready to provide expert advice tailored to your specific needs.

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Minimum Values 
For Walls

Minimum Values 
For Ceilings











R5.0 - R6.0

R5.0 - R6.0

R5.0 - R6.0



Upgrading to a Higher R-Value

As energy costs continue to rise, many homeowners are opting for higher R-Values than what's minimally required. Investing in a well-insulated home pays off in the long run, with reduced energy consumption, lower greenhouse gas emissions, and overall year-round comfort.

Typically, the payback period for home insulation ranges from 3 to 5 years. This means that the cost of insulation is recouped through energy savings within a relatively short timeframe. Remember, the higher the R-Value, the greater the potential for substantial savings on your power bills.

Comprehensive Insulation: Beyond Ceilings and Walls

While ceilings and walls are primary areas for heat loss and gain in a home, comprehensive insulation should also consider other essential areas.

Underfloor Insulation
best underfloor insulation product

For optimal energy efficiency, we recommend a minimum R-Value of R2.0, with an upgrade to R2.5 for cooler locations such as Hobart, Melbourne, and Adelaide. Effective underfloor insulation helps maintain a comfortable indoor climate, especially during colder months.

Internal Wall and Midfloor Insulation
double brick cavity insulation

Insulating internal walls and between floors allows you to create distinct climate zones for more energy-efficient heating and cooling. Additionally, installing R2.5 acoustic insulation in internal walls and between floors enhances sound insulation, providing a more peaceful living environment.

Ceiling Insulation Between Floors
ceiling insulation perth

Installing R4.0 or higher ceiling insulation between floors not only improves thermal performance but also significantly reduces sound transfer. Our recommended product, Knauf Earthwool Sound Shield insulation with an R4.0 thermal rating, is perfect for this application.

Longevity and Maintenance of Insulation

When installed correctly, thermal insulation batts remain effective for a considerable time, with most fiber insulation brands offering guarantees of 30 to 50 years. However, improper installation, such as leaving gaps or compressing the batts, can accelerate wear and tear, leading to decreased efficiency.

Insulation batts generally have a longer lifespan than blown-in insulation. Blown-in insulation can settle over time, particularly in walls, reducing its effectiveness. For retrofitting wall insulation in existing homes, choosing insulation batts is the recommended approach.

Checking the R-Value of Insulation

The R-Value of any insulation product can be easily found on the packaging provided by the manufacturer. At Insulation Extract, we ensure complete transparency by clearly indicating R-Values for all our insulation products on our website.

If you require assistance or have specific insulation R-Value needs, don't hesitate to contact us. Our team of experts is always available to guide you towards the best insulation solutions for your home.

In conclusion, understanding and choosing the right R-Value for your thermal insulation are vital steps in creating a comfortable, energy-efficient home. With Insulation Extract's premium insulation products and expert advice, you can take control of your home's thermal efficiency and enjoy the benefits of a well-insulated living space year-round.

Why Choose Us to Install your New Insulation?


We are the only WA company to gain Knauf Insulation accreditation as a Approved Installer of Knauf Insulation blow in products. All our installers are regularly assessed and tested to ensure all installations meet the highest standards set out by our company goals and Knauf Insulation.


All the products we supply & install are CodeMark™ approved & tested. CodeMark™ is the highest level of product compliance in Australia, which is your assurance of the product’s suitability for use in your home and that it will perform as it should. CodeMark™ certification will also provide a smooth compliance pathway with local building authorities


Insulation Extract is both a HIA & Master builders member in WA. We are more likely to be up to date with the latest regulations and techniques and are committed to the sustainability of the industry as a whole. Members are also subject to a Code of Conduct, which contains ethical standards ensuring the highest quality of workmanship is achieved.

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All our staff are fully insured. We have $20 Mil public liability and full workers compensation giving you peace of mind that you are dealing with professionals.

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