Earthwool ceiling batts installed in Perth

Ceiling Insulation Perth

Insulation Extract installs ceiling insulation in Perth homes using Knauf Earthwool® batts, sized to the right R-value for your roof and fitted by our own trained crews. Keep the summer heat out and the winter warmth in, with a free on-site assessment across the metro area.

Currently accepting bookings.

On-Site

Tile Roof Retrofit

Extraction & Batts

1. Old blown-in removal via vacuum

2. Earthwool® batts install

ISO 9001 • 45001 • 14001

EEC Certified

Earthwool® ECOSE

50-Year Warranty

1,500+ reviews

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Updated 27 October 2026

Ceiling insulation installers for Perth and surrounding suburbs

Ceiling insulation provides a thermal barrier that slows the transfer of heat energy through the roof, and the ceiling can account for up to 30% of your home's energy efficiency. In Perth, where a dark tiled or metal roof can bake all afternoon in January, an uninsulated or poorly insulated ceiling lets that heat pour into the rooms below.

Without ceiling insulation you will spend more trying to hold a comfortable temperature, running air conditioners through summer and heaters through the cold winter nights. Our crews retrofit existing homes from Joondalup and Wanneroo down to Rockingham and Mandurah, and out to Midland, Kalamunda and the Hills.

Diagram of heat loss from an uninsulated house through the ceiling, windows, walls, floor and draughts

What R-value ceiling insulation does a Perth home need?

Insulation is measured by either U-values or R-values. Bulk insulation, the batts or blow-in material that sits on top of your ceiling, is rated by R-value, which stands for thermal resistance. The higher the R-value, the better the thermal performance. Think of it as the difference between wearing a t-shirt and a thick woollen jumper in winter.

The R-value depends on the material and its thickness, so a higher-rated batt is generally a thicker batt. Perth is in climate zone 5 under the National Construction Code, with hot summers and mild to cool winters, and homes here benefit from a generous ceiling R-value because so much summer heat arrives through the roof.

Existing Western Australian homes
we recommend retrofitting R3.5 to R5.0 batts to the ceiling.
New construction homes
we recommend R3.0 to R5.0.

Insulation Extract offers a range of ceiling R-values so you can match the product to your budget and, more importantly, your family's comfort. Your assessor will explain the options for your roof space on the day.

Installer rolling out glasswool insulation between timber framing

Knauf Earthwool ceiling batts

Insulation Extract only supplies and installs Earthwool® insulation batts. Earthwool® comes in a selection of R-values, giving builders, designers, installers and homeowners the chance to choose the best thermal performance for each project.

Earthwool® ceiling batts are made using up to 80% recycled glass and ECOSE® Technology, a bio-based binder that contains no added formaldehyde. They are soft to handle, which makes for a neat, tight fit between ceiling joists, and they carry a 50-year manufacturer warranty.

Earthwool R-value guide for floors, walls and ceilings

Benefits of ceiling insulation in Perth's climate

Perth is known for its sun-soaked summers and mild winters, but that weather comes at a price. During a run of 38-degree days, an uninsulated home can become uncomfortably warm well into the night. In winter, heat escapes through the ceiling just as easily. Insulation acts as a barrier that reduces heat transfer in both directions, so you can:

Boost energy efficiency
rely less on heating and cooling, which means lower energy bills.
Enjoy better comfort
fewer temperature swings through the day and night.
Save over time
the upfront cost of insulation is recovered through ongoing energy savings.

Your choice of material also matters for indoor air quality. Modern glasswool is designed to address the respiratory concerns of older fibreglass products, which is one reason we use Earthwool with its formaldehyde-free binder.

Earthwool ceiling batts laid between joists in a roof space

Ceiling insulation options for Perth homes

Earthwool glasswool batts

Blanket insulation such as glasswool batts is the most common ceiling product. It offers reliable thermal resistance and is our standard recommendation for accessible roof spaces with conventional joists.

Blow-in insulation for tight roof spaces

Loose-fill insulation is ideal for irregular or low-clearance roof spaces because it gives full coverage where batts are hard to lay. We install modern glasswool blow-in insulation for these situations.

Board and cavity wall insulation

Rigid boards are usually placed between the skins of double brick walls during construction. For existing Perth homes, we insulate the walls instead by pumping glasswool into the cavity with our cavity wall insulation service.

Reflective foil and spray foam alternatives

Reflective foil reflects radiant heat away from the home, which suits Perth's strong sun, but it has to go in during a new build or a full roof replacement. For existing homes, spray foam insulation is a practical alternative in skillion roofs and other awkward areas.

How we install ceiling insulation in existing Perth homes

Professional installation keeps mess to a minimum. Insulation can be added from inside the home through the manhole or from outside by lifting roof tiles or sheeting. We usually prefer the external route because it keeps dust and traffic out of your living areas and gives the crew better light and ventilation.

If the roof space already holds old, flattened or dirty insulation, we remove it first with a ceiling vacuum so the new batts sit flat on a clean ceiling. Batts are then fitted edge to edge between the joists, with the required clearances kept around downlights, exhaust fans and flues. Improperly installed insulation will not deliver its rated performance, which is why the right product, the right R-value and professional installation all matter.

Roof space with new ceiling batts fitted under timber rafters

Why Perth homeowners choose Insulation Extract

We are the only WA company to have gained Knauf Insulation accreditation as an Approved Installer of Knauf blow-in products. All our installers are regularly assessed to make sure every installation meets our own standards and those set by Knauf Insulation.

All the products we supply and install are CodeMark™ certified. CodeMark™ is a high level of product compliance in Australia and your assurance that the product is suitable for use in your home and will perform as it should. It also provides a smooth compliance pathway with local building authorities.

Insulation Extract is a member of both HIA and Master Builders in WA, so we keep up to date with the latest regulations and techniques and work under an industry code of conduct. All our staff are fully insured, with $20 million public liability and full workers compensation cover. Since 2014 our teams have retrofitted more than 45,000 Australian homes.

To book a free ceiling insulation assessment in Perth, call (08) 9302 2699 or use the quote form on this page.

Ceiling insulation batts fixed above metal ceiling battens before plasterboard

Earthwool batts installed edge to edge across a ceiling

Frequently Asked Questions

What is the main purpose of ceiling insulation in a Perth home?

It slows heat moving through the ceiling. In summer it keeps roof-space heat out of your rooms, and in winter it stops warmth escaping, so you rely less on air conditioning and heating.

What R-value should I choose for my Perth ceiling?

For existing homes in Western Australia we recommend R3.5 to R5.0 ceiling batts. Higher R-values give better resistance to heat flow. Your assessor will recommend a rating that suits your roof space and budget.

How much can ceiling insulation save on heating and cooling?

Savings depend on your home, the existing insulation and how you heat and cool it, but insulation reduces heat transfer and the load on your air conditioner and heater. Over time the energy savings recover the upfront cost.

Is ceiling insulation installation messy?

Not when it is done professionally. We usually access the roof from outside by lifting tiles or sheeting, which keeps the crew, the equipment and the dust out of your living areas.

Do I need to remove my old ceiling insulation first?

If the existing insulation is old, compressed, dusty or patchy, we recommend removing it with a ceiling vacuum before the new batts go in. New batts then sit flat on a clean ceiling and perform as rated.

Is Earthwool safe for people with allergies?

Earthwool is made with ECOSE® Technology, a bio-based binder with no added formaldehyde, and is soft to handle. It is designed to address the respiratory concerns associated with older fibreglass products.