Insulation for Existing Floors2024-06-05T13:49:27+00:00

Make Your Home Comfortable and Energy Efficient

Insulation for Existing Floors Canberra

Make your existing Canberra home warm in winter and cool in summer with our high-performance floor insulation solutions

Your floor does not have to be freezing cold and draughty during the icy Canberra Winter. No matter the age of your home, there is a high-performance retrofit insulation solution available.
Spray foam insulation locks in heat and seals out draughts.
No Canberra home needs to have uncomfortable floors… ever.
Spray foam insulation (SPF) is a spray-applied insulation that is widely used to insulate buildings and seal cracks and gaps, making the building more energy efficient and comfortable.
SPF insulation is known to resist heat transfer extremely well and it offers a highly effective solution in reducing unwanted air infiltration through cracks, seams and joints.

Why spray foam instead of installing batts under your floorboards?

There are a number of reasons why, one of the most important being that floor insulation should not be measured in “R Value” alone.

Traditional Batts Spray Foam Insulation
Protects against conductive heat loss (R-rating) Yes Yes
Protects against convective heat loss (draughts) No Yes
Resistant to moisture that can reduce thermal performance? No Yes
Guaranteed not to sag/fall away over time? No Yes
Prevents rodents from nesting? No Yes
Protection from heat loss via ‘windwash’ No Yes
Provides an air tight seal to prevent infiltration No Yes
Provides an air tight seal to prevent infiltration of dust and contaminants from the sub floor. No Yes
Reduces squeaky floor boards No Yes

Benefits of Floor Insulation

NO MORE DRAUGHTS

Insulation and draught sealing in one.

CREATE AN AIRTIGHT SEAL…

Heat rises, so why worry about insulating the floor? Yes it is true, heat rises, and will move to the top of your house, however the convection will continue to bring the cold air from outside up through the floorboards and continue to cool the house down. What our high-performance spray foam insulation does is create an airtight seal.

AN END TO SQUEAKY FLOORS

Spray foam insulation eliminates all the squeaks.

NO MORE NOISY FLOORBOARDS…

High-performance spray foam insulation under your floors creates a perfect airtight seal under your home but one of the other major benefits to installing this product is that you will forever eliminate noisy or squeaky floorboards. Prepare yourself for comfortable warm floorboards in the winter months that are just as quiet to walk on.

THE HEALTHY CHOICE

An airtight seal means no irritants coming through the floorboards.

NO MORE DUST…

Having gaps in your floorboards means dust and other irritants can easily blow into your home from the gap under the floor aggravating allergies and causing discomfort. By installing high-performance spray foam insulation not are you only creating warm, quiet floorboards but the airtight seal means you lock out these unwanted irritants.

NO SAGGING BATTS

Spray foam insulation adheres directly to the underside of the floor.

SPRAY FOAM STICKS AND STAYS…

If you have batts installed under your floorboards they will more than likely begin sagging over time reducing the insulation and still leaving gaps under the floor. Unlike batts that will sag, high-performance spray foam insulation adheres directly to the underside of the floorboards and will create a airtight seal under your home for life.

Why Choose Alexander Watson – Canberra’s Insulation Specialists?

  • Leading Insulation Specialist in the ACT

  • Established since 2011 with a reputation for excellence

  • Certified People – We only use EEC Certified Installers

  • Certified Products – Ensuring the best materials for the job

  • Protect Your Investment – Lifetime Warranty on insulation

  • Professional & Reliable Team delivering high-quality service

Government Assistance & Rebates

Landlords may be eligible for a 50% rebate (up to $2,500) on insulation installation costs when upgrading to R5.0 or higher in an existing home.

testimonials

Our Clients Love us

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4.9
Based on 308 reviews
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Peter Monus profile picture
Peter Monus
11:11 20 Jan 26
We hired the team at Alexander Watson to install ceiling insulation, wall insulation, ducted AC and an electrical switchboard upgrade in our 1960s house with some unique challenges. The process of working with the initial inspection and booking in the various stages of the install was really easy and the team was great at communicating different issues and decisions that needed to be made along the way.

We could feel the difference in temperature the day after the ceiling insulation went in and it does such a good job keeping the house cooler on hot days. We look forward to the house being much easier to keep warm when winter rolls around too. The ducted AC unit that was recommended to us works really well, is very quiet and the controller is easy to use or can be controlled with an app.

Would definitely recommend Alexander Watson, they know their stuff.
Deborah Reynolds profile picture
Deborah Reynolds
12:20 29 Dec 25
A few months ago, I asked Alexander Watson to insulate my home - ceiling, wall and underfloor. They were meticulous, and included everything that was needed in the quote - the probability that I needed a new switchboard to comply with updated regulations, making sure the wiring was compatible with insulation - everything. When some work wasn’t needed, they reduced the amount I had to pay to match the work that was actually done. They booked everything so the work was done as quickly as possible. They kept me informed throughout the installation so I knew exactly when they were coming and what was being done. They took before and after photos of every step, to ensure they were keeping to their standards. I was impressed by their safety protocols. I was also impressed that when they came to inspect the work once it was complete, they realised that something hadn’t been done, and quickly ensured that was done too. We were amazed at how much warmer the house was, even though it was after the end of winter, and we hadn’t expected to notice any difference. We’re even more impressed now it’s summer and we’ve had heat waves. I really didn’t expect so much difference since the house is an older brick veneer house, and we haven’t fixed any ventilation issues.
brenda sharp profile picture
brenda sharp
02:57 15 Dec 25
Very pleased with Alexander Watson for my ceiling insulation. At all stages of the process staff were prompt, courteous and communicated well. Job was completed as agreed I would recommend them
domdomdom128 profile picture
domdomdom128
23:46 26 Nov 25
We had ceiling, walls and underfloor retrofitted after vacuuming out decades old debris.
Insulation is excellent but the service and staff are what you pay for, they're all super friendly and helpful.
Insulation went smoothly over 2 days, you get what you pay for, premium service and super nice staff.
4 months post install we had an issue with a leak from the condensation pipe of our aircon in the roof, hadn't turned it on since insulation was installed so wasn't aware.
Wally from AWI came out 2 days later and fixed it on the spot.
Always a warm reception when calling, after instal service is amazing. Can't recommend enough.
Helena Norback profile picture
Helena Norback
03:28 24 Nov 25
Had recent work done to install insulation/electrical and air con replacement, very happy with the work. When they came round to quote it was highly informative and answered every query I had. Punctual and professional every step of the way and I swear my dog would've gone home with every one of them if I hadn't held her back. Highly recommend.
Mike Hughes profile picture
Mike Hughes
06:11 18 Nov 25
Rarely do you get lucky enough to have work done on your home in such a effortless manner with a superb final product done by polite, professional and knowledgeable trades folk that turn up when they said they would and do the job in the way they said they would. To do all the work at our place in Gowrie we had people putting up scaffold, people doing the roof insulation, people doing the electrical work, people putting sealer on the bricks, people under the house spraying insulation, at one point we think we had 12 trades folk here. They cleaned up after themselves when finished. Best of all the product has already proved its worth. I could not speak higher of the Alexander Watson team, all of them the product they sell and the advice they give. The photos show under the floor and the sealer on the bricks. I’m no longer allowed up a ladder so I can’t show the ceiling work.
Tamara Cutcliffe profile picture
Tamara Cutcliffe
23:43 04 Sep 25
Having earthwool insulation installed exceeded my expectations. The multidisciplinary team were fantastic. The house is warmer and no doubt will be cooler in summer. Thoroughly recommended.
Jareth Maros profile picture
Jareth Maros
03:07 17 Jun 25
Contracted Alexander Watson to remove old insulation batts and remove loose fill from the ceiling.
To be honest, the experience was not a great one.
First point to raise is the constant email replies from different admin stuff. After correspondence with one team member, the following reply would be from a different team member. I found this frustrating. And then that new team member has not read the previous email (this would also be in a working day time frame).
Now the point to raise is of quality of work, they had only cleaned approx 80% of the ceiling, they spent 2 days (a Thursday and Friday). I know this because I cleaned the remaining missed areas including removing old batts on my Saturday so I could lay the insulation properly myself. If I hadn’t of laid the insulation myself and Alexander Watson returned to re-install, then I feel the missed areas would still remain and they would just install over the top. Additionally approx 6 tiles were broken, and they were only siliconed back together.
Now after email correspondence, and I assume with the manager, being told as a customer I should of raised my concerns on the Saturday so this company can return to do a quality check, I feel this should of been done at the workers level before they would of left the job site, then possibly another senior team member should of visited the job site post completion to confirm the work is done. This process has failed from the lowest part of the team. I’ll attach photos to this review.
Now we have both come to an agreement to a reduction in the invoiced amount.

Insulation FAQ’s

Why do I need to remove the insulation from my ceiling?2024-02-16T13:54:54+00:00

Removing insulation from a ceiling might be necessary for many reasons, such as renovations, pest issues, installing new insulation, electrical safety and health. For more information see our insulation removal page here.

What is the purpose of crosshatching/adding another layer of insulation?2024-04-17T05:11:45+00:00

Cross-hatching two layers of insulation results in a substantial improvement in insulation efficiency. For more information about cross-hatching, download our Retrofit Guide here.

How do I choose ceiling insulation?2025-08-06T04:54:41+00:00

It all depends on the type of roof and the ceiling cavity. Usually batts are the best option, however in some cases a loose insulation or other specialised product might be a more effective solution.

How big are the drill holes and how are they filled in?2024-05-13T03:00:42+00:00

When the installers are doing wall insulation they will drill small holes under the windows to ensure all parts of the wall is being insulated. The drill holes are 16mm in diameter and are drilled in between the bricks. To fill them in we use mortar. If your mortar is not a standard grey, our team will aim to get the colour as close as possible to leave a seamless finish.

Can electrical work be done after wall insulation?2024-05-13T01:53:26+00:00

Installing cavity wall insulation can make electrical work more challenging. We recommend completing any wiring or electrical work before installing cavity wall insulation. Insulation doesn’t block access entirely, electricians can add wiring in at a later stage using a fibreglass straw rod, though it’s more complex than in an empty cavity. However, any insulation related electrical compliance  work will need to be completed before the wall insulation is installed.

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