The easiest way to increase the R-value of a bulk insulation product is to increase the roof insulation thickness. R6.0 ceiling insulation batts are typically between 250mm and 275mm thick. These glasswool products can be easily cut using a sharp long bladed knife. R6.0 ceiling insulation is an effective barrier against the summer heat and winter cold.

Maximise Your R6.0 Insulation Potential

ICANZ claims that you can save up to $299 per year on your electricity bill with ceiling insulation (depending on your climate zone). The higher the R-value, the better the thermal performance of the insulation. For many years, R6.0 insulation was the highest available rating for Earthwool and Pink Batts. Today we also sell Pink Batts in R7.0, and Earthwool is available in both R7.0 and R8.0.

If your ceiling was insulated many decades ago, there is a good chance that it has lost some of its effectiveness. Even if the insulation was considered a good quality product at the time, it might be delivering less thermal benefit than it was originally specified to deliver, and it may be time to consider an upgrade. Where you live in Australia will effect the type and level of insulation required. Passive design techniques should be used in addition to R6.0 insulation.

Topping Up Your Ceiling With R6.0 Insulation

Bulk insulation may loose it's effectiveness over time, in particular if it has been compressed or subjected to water damage. Because insulation is full of tiny air pockets, the more it is compressed, the less effective it becomes in reducing the transfer of heat. Before deciding whether to book a professional insulation removal service, or whether to increase the roof insulation thickness simply by topping up the existing insulation, consider the following:

All old insulation will have some R-Value however very old insulation is typically extremely dusty and will often smell;
The effectiveness of the R-Value of any existing insulating material will depend on how well it was installed originally, and how much it has compressed over time;
It’s more difficult to get a neat finish when topping up old insulation with new insulation than just installing completing new insulation;
Modern insulation (at least the brands we sell) does not attract vermin, however many older insulation types have proven to become nests for vermin.

If your house has properly installed insulation but requires a higher R-Value, topping up with new insulation may be a viable alternative. However, if the insulation that was previously installed is distributed unevenly, is of poor quality, or has attracted vermin, we recommend cleaning out the ceiling first, and then replacing it with new insulation.