Ceiling insulation is designed to protect your home from the harsh external temperature variations. The bulk insulation material works as a thermal break; keeping your home cooler in the summer and warmer in the winter. When sufficiently insulated, ceiling insulation can reduce heat flow up to 35%. This reduction equates to a similar savings in heating and cooling bills, meaning you not only save money, but reduce your carbon emissions and live more sustainable.

Choosing the Right Insulation

Ceiling insulation is measured in different thicknesses, which are determined by an R Value. An R Value is a standardised measurement of heat resistance, or how well a product works as an insulator. The minimum standard specified by the Build Code of Australia is an R4.0 insulating material. However, this can differ based on your location in Australia, colour of your roof and if there is any roof insulation (under the roof directly, not ceiling insulation).

Take a look at the following map and table to see what minimum ceiling insulation you require.

Climate Zone Perth
Dark coloured roof tiles or metal roof (solar absorptance > 0.6)and no sarking R5.0
Dark coloured roof tiles (solar absorptance > 0.6)with Enviroseal ProctorWrap Roof Tile sarking, with VENTS R5.0
Light coloured roof tiles or metal roof (solar absorptance between 0.4 – 0.6)and no sarking R4.1
Light coloured roof tiles (solar absorptance between 0.4 – 0.6)with Enviroseal ProctorWrap Roof Tile sarking, with VENTS R4.1
Dark coloured metal roof (solar absorptance > 0.6)with ResiWrap sarking, with VENTS R4.1
Dark coloured metal roof (solar absorptance > 0.6)with Anticon 55, without VENTS R3.0
Light coloured metal roof (solar absorptance between 0.4 – 0.6)with ResiWrap sarking, with or without VENTS R4.1
Light or off white/cream coloured metal roof (solar absorptance ≤ 0.4)with Anticon 55, without VENTS R2.0
Off white/cream coloured metal roof (solar absorptance ≤ 0.4)and no sarking R3.5
Off white/ cream coloured metal roof (solar absorptance ≤ 0.4)with ResiWrap sarking, with or without VENTS R3.5

Insulation Materials

There is a variety of insulation materials available for your ceiling insulation. We’ve broken down the pros and cons for each type of ceiling insulation.


Fibreglass Batts

Fibreglass insulation has evolved a lot since the failed Home Insulation Scheme adopted by the Rudd government in 2009. Fibreglass batts are fire and mold resistant, do not absorb water and have a long life span. The fibreglass fibres typically known for respiratory problems are larger and do not cause issues previously associated with glass wool products. The Bradford range of insulation is approved by the Asthma Council of Australia. The fibreglass ceiling insulation is made from recycled glass, making it one of the cheapest products and most widely used products on the market.

Brands: Bradford Gold, Fletchers Pink Batts, Knauff Earthwool, Termico, John Mathers


Wool Insulation

Wool ceiling insulation is one of the oldest forms of insulation used in Australia. Normally emulsified and blown into the roof cavity, wool insulation provides one of the best thermal insulators on the market. However, wool insulation is prone to infestation with rodents and insects due to the lanolin and organic material. The wool fibres will collect water if wet, and therefore often needs to be replaced in roof leaks occurs. Products like Earthwool is in fact made of fibreglass, whilst other products blend fibreglass and polyester.

Brands: Jumbuck (Albany Wool Batts), InsulFluff


Polyester Insulation

Polyester ceiling insulation is one of the best insulators in terms of low toxicity and environmentally friendly. Polyester is volatile organic compound (VOC) free, therefore is perfect for allergen sufferers that may reach to fibreglass and wool insulation. It can be more expensive than fibreglass batt insulation, but is still cheaper than 100% wool insulation. The perfect choice for allergen and dust sufferers.

Brands: Bradford Polymax, Autex, GreenStuff

Ceiling Insulation Installation

Ceiling insulation can be installed one of two ways; either via the manhole located inside the home, or externally via the roof. At InsulGuard, our qualified installers generally prefer to access the property externally. For a tile roof, it’s a matter of removing a dozen or so tiles to create an access point. For a tin or Colorbond roof, we generally remove one sheet to gain access to the roof cavity. Both are accessed via a ladder up on to the roof, and it is common for us to open a couple of entry points around the home to minimise walking across the roof.

There are a few benefits of accessing the roof space to install ceiling insulation. Firstly, it is safer for our installation team as they can let in some light and ventilation into the roof cavity, making it safer for them to work and reduce the risk of slipping and damaging your ceiling. Secondly, unless the home is a new build, most man holes inside the home are too small to fit the insulation bags in. This means that we are opening insulation inside your home, as well as walking through your home, which can create unwanted mess. Lastly, no one needs to be home when we access via the roof. All our installers are police checked and we provide before and after photos upon request.

Contact the experts at InsulGuard for an obligation free quote on 1300 467 854 or by filling out the below form.

You may also be interested in:
Wall Insulation
Underfloor Insulation
Roof Insulation
Insulation Removal

Ceiling Insulation Perth