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R Value of Materials

The R-value is a measure of thermal resistance used for insulation materials. The higher the insulation R-value the better the thermal performance and the slower the heat loss or gains. Investing in a higher value can help to reduce energy wastage.

Resistance to Heat Flow

A typical Australian home has 70mm or 90mm wall studs. The highest rated residential product to fit a 90mm spacing is an R2.7 wall batt. Common R-values for walls include R1.5, R2.0 and R2.5 insulation.

Reduce Heat Loses

Local climate and budget are two factors which help determine what products are best for your home. Roof insulation R-value ranges from R2.5 to R7.0 and are between 120mm and 290mm thick.

The insulation batt ratings or “R-ratings” will also depend on your own preferences and budget. Insulation with a higher R-Value will generally cost more than insulation with a lower rating. Much of this is due to the fact that a higher rating requires more insulation material, and this will naturally attract a higher cost. An un-insulated house will benefit greatly from even a small layer of thermal ceiling insulation being installed. There is a point at which adding more of even the best insulation material will no longer have a noticeable impact on energy usage or indoor temperature. In many areas of Australia, this is will be somewhere between the R5.0 and R6.0 range. If you already have e.g. an R6.0 insulation installed in the ceiling, then it’s recommended that you look at other energy saving alternatives before simply adding another layer of insulation. Contact Us for more advice on selecting an appropriate R-value.