Home Insulation
What to look for when buying and installing insulation and the pros and cons of different insulation types.
Insulation batts- If you're building a new home or renovating an existing one, don't forget about insulation. It's the material that is used to control heat transfer – so you're cool in summer and warm in winter. The information below covers the important facts you will need to consider when selecting your insulation type.
Features to consider
R-value
The performance of insulation is measured by its R-value. A high R-value means greater resistance to heat flow into the building in summer and out of the building in winter – in other words, the higher the R-value, the more effective the product. Recommended R-value's differ across Australia depending on climate, with highest being four and lowest being one. The recommended R-value of a ceiling is usually double that of the walls. Note: Thicker doesn't mean the R-value is greater.
Cost
The cost of insulation varies. The biggets difference in prices comes down to whether you choose DIY insulation or a product that requires professional installation. The higher the R-value the higher the initial cost but you'll save on energy bills down the track, good insulation can reduce your energy bills by as much as 55 per cent.
Climate / location
Where you live will determine what type of insulation you choose. The Building Code of Australia has set out minimum insulation requirements for eight climate zones within Australia. For example homes in Western Sydney require roof insulation with a minimum R-value of 3.2 in winter. Those in Cairns need only an R-value of 2.2 in summer. Eureka Insulation will be able to advise you which zone you live in.
Safety
All products must come with flammability test certificates. Some insulation types can cause irritation to skin, eyes and nose so protective clothing must be worn during installation.
Thermal versus acoustic
Insulation is used to control sound as well as temperature and unlike thermal insulation, the more thick and dense, the more soundproof it will be for your home.
Types of insulation
There are two main types of insulation; some people use a combination of both.
Bulk insulation
Bulk insulation works as a physical barrier to the flow of heat. Types include cellulose fibre, sheep wool, polyester, glasswool and rockwool.
Pros
- Very effective in cooler climates
- Can double well as acoustic insulation
Cons
- Will lose effectiveness when damp
- Irritation to skin, nose and eyes can occur when installing some types
Reflective insulation
As the name suggests, reflective insulation works by reflecting heat away with its polished metallic surface. Types include aluminium foil sarking, foil boards, E-therm and foil batts.
Pros
- Very effective in warmer climates
- Acts as barrier to moisture
- Takes up less room than bulk insulation
Cons
- Needs to be combined with bulk insulation to be effective during winter in cooler climates
- Dust can settle on its surface, reducing effectiveness
