What does R-Value mean? How much do I need?

banner image of man installing wall insulation. Blog post explaining what insulation R-value is.

What to consider when choosing an R-value

The R-Value – or R-Rating of thermal insulation measures how resistant the insulation is to heat transfer. A higher R-value means a higher insulating rating – i.e. a higher resistance to heat transfer. New buildings are general specified at the design stage as requiring a certain R-value.

Photo of a woman with a Knauf Earthwool Wall Insulation pack with an R-value of R2.5If you are building a new home then the minimum R-values are included in the energy report. These are the minimum R-values that you need to install in order for your house to receive a Certificate of Compliance (COC).

If you live in an existing home with no thermal insulation installed in the ceiling, then installing insulation of any R-Value will in most cases significantly reduce the amount of heat entering and leaving your home.

Upgrading to a higher R-value

The rising cost of energy in Australia means that many home owners are choosing to invest in higher R-values than those specified on their energy report. A well-insulated home costs less money to heat and cool, emits less greenhouse gases and provides year round comfort.

As a rule of thumb, we recommend a minimum of R2.0 wall insulation and R4.0 ceiling insulation. If you plan on living in your home for several years and are looking for a long term investment, then we recommend installing the best insulation that you can afford.

For optimal results we recommend R2.5HD for the external walls, R6.0 for the ceiling and R2.0HD for the internal walls. Underfloor insulation is recommended for homes with suspended floors, particularly in cooler climates. To discuss your recommended insulation R-value needs, please contact us.

$ 4.46$ 12.02 p/m2 inc. GST
$ 4.58$ 11.44 p/m2 inc. GST
$ 3.01$ 11.44 p/m2 inc. GST
$ 5.51$ 7.75 p/m2 inc. GST



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