What and how to install
The effectiveness of insulation (or any other building material for that matter) is indicated by is ‘R-value’ – the higher the R value, the higher is resistance to heat flow. One type of insulation may be thicker or thinner than another, but if they both have the same ‘R-value’, they will perform equally. This makes it easy to compare products. In Alice Springs, the recommended R-Value for ceiling insulation is R3.5; for walls, it is 1.5.
The optimal configuration for typical cavity roofs and walls in Alice Springs is as below:
Tips to maximise insulation performance
Poorly installed insulation can drastically reduce its effectiveness (and is a waste of money!). Follow these tips to maximise the performance of your insulation:
- Reflective foil insulation requires an air gap of 25mm adjacent to the reflective surface;
- Ensure that there are minimal gaps (ie insulation should fit snugly against roofs battens);
- Ensure that adequate gaps are left around any heat sources, such as recessed ceiling lights, as this is a fire risk;
- Heat loss will still occur in winter if there are large areas of unprotected glass or through fixed wall vents and gaps and cracks around external doors and windows; appropriate internal window coverings (e.g. lined drapes with pelmets) and draught proofing are vital to complement insulation.
- Insulation will be most effective when installed in houses that have light coloured roofs and walls; and windows and walls (especially east and west facing) that are adequately protected from direct sunlight in summer.
More information
For more information visit the Your Home Technical Manual.
