There are a variety of insulation materials commonly used in wall insulation in Australia. Each material has its own advantages and disadvantages, and the best choice will depend on a variety of factors, including the climate, the construction of the home, and the homeowner's budget. Here are some of the most common wall insulation materials and their pros and cons:


Fiberglass is a popular insulation material because it is relatively inexpensive and easy to install. It is also fire-resistant and does not absorb moisture. However, it can be itchy to handle and may not be as effective at reducing air leaks and energy loss as some other materials.



Cellulose insulation is made from recycled paper products and is an environmentally friendly choice. It can be blown into walls and provides good sound insulation. However, it can absorb moisture and may be more prone to mould growth.


Spray foam

Spray foam insulation provides excellent insulation and can reduce air leaks and energy loss. It can also provide moisture and air barriers. However, it is more expensive than other insulation materials and requires professional installation. It can also release toxic fumes during installation if not done correctly.



Rockwool is made from natural materials and is fire-resistant. It is also a good sound insulator and does not absorb moisture. However, it is more expensive than fiberglass and may be more difficult to install.



Polystyrene insulation, either expanded (EPS) or extruded (XPS), is a good choice for wall insulation as it is lightweight, durable and resists moisture. However, it is derived from petroleum and may have negative environmental impacts. Additionally, it is not biodegradable and can release toxic fumes if it catches fire.

In summary, each type of insulation material has its own unique advantages and disadvantages. Homeowners should consider the climate, their budget, and their environmental concerns when choosing the best insulation material for their walls. It is also important to have insulation professionally installed to ensure it is effective and safe.