Insulation materials can range in cost from around $5 to $40 per square metre. Other roof insulation cost you may need to consider include labour, job complexity, and roof size. For an average roof size of 250 m², the entire project may run you around $1,500 to $22,500. That’s a big range, so let’s break down the numbers so you can get a better idea of what you may face.
Key takeaways
There are various factors that contribute to the cost of insulation in Brisbane.
Different materials come in a range of price points.
Labour costs can be affected by various factors.
An R-value of 4.0-4.5 can be effective for Brisbane’s hot climate.
Roof insulation can contribute significantly to energy savings.
How much does insulation cost in Brisbane?
Estimates in this article are taken from servicetasker.com.au and Hipages.com.au.
Roof insulation costs are affected by several factors. Here are price ranges you could expect to pay.
Materials
There are two main types of insulating materials: bulk insulation and reflective insulation. Bulk materials typically come as batts or rolls and work by trapping heat in small air pockets inside the material. It may also come as a loose-fill insulation that’s blown into a roof cavity. Reflective foil bounces radiant heat off its surface to either keep it out of a house or prevent it from escaping.
Here are rough estimates for common insulation materials:
Spray foam insulation. $40 – $90 per m².
Reflective foil insulation. $6 – $14 per m².
Glass wool batts. $8 – $10 per m².
Foil-backed blanket insulation. $6 – $11 per m².
Polyester batts. $11-$15 per m².
Rockwool insulation. $30-$40 per m².
Labour costs
Some parties opt for DIY roof insulation to save some money. However, installing insulation can be complex. This can make professional installation the better bet. Labour is usually priced by the hour and generally falls between $60 and $120 p/h. Installation costs can be affected by a number of issues, such as:
The more experienced the contractor, the higher their rate may be.
A roof space with a more complex design can increase the amount a contractor charges.
Materials like spray foam can require more specialised expertise, tools, and protective equipment. This usually comes with higher labour costs.
What R-value do Brisbane homes need?
R-value is a measure of an insulation material’s thermal resistance, usually falling between R1.5 and R7.0. A higher R-value means the material has better thermal insulating properties. Brisbane has a subtropical climate. An R-value of 4-4.5 is typically considered appropriate.
Local building regulations require new homes to adhere to the National Construction Code (NCC). The NCC’s energy efficiency standards for new houses effectively make a minimum of R4.0 necessary for ceiling insulation.
Is roof insulation worth the investment?
Insulation is one of the most cost-effective investments you can make to regulate your house’s temperature in cold and hot climates. In Brisbane, appropriate insulation helps keep your home comfortable during the hot summer months. A well-insulated home can also help keep your energy bills down by reducing the need for air-conditioning.
How you can keep the cost down
There are tips you may follow to try to reduce how much insulation costs.
DIY installation can help you save on labour costs as long as the insulation is installed correctly in your ceiling cavity.
Get multiple accurate quotes. You generally want to speak with at least three different contractors to see what prices are available.
Check whether there are any government rebates available on new insulation installations.
Conclusion
The cost of roof insulation depends on various factors, including the insulation type, the labour used, and the specifics of the project. As a long-term investment, insulation provides significant benefits like power bill relief. However, there are ways you can try to keep the cost down.
Are you looking to install insulation?
The Infinite Roofing team has been a trusted metal roofing partner for the Brisbane community for over a decade. Contact us today for a free quote.
