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Wall Insulation

Why Insulate Your Walls?

At Blow Insulation, we specialise in enhancing the thermal efficiency and comfort of your home with our wall insulation services. Our blown insulation technique is designed to fill gaps and cavities within your walls, providing superior thermal performance and soundproofing.

Insulating your walls is one of the most effective ways to improve your home’s energy efficiency. By reducing heat loss, you can maintain a consistent indoor temperature, resulting in lower energy bills and a more comfortable living environment. Additionally, our insulation materials act as a barrier against noise, creating a quieter home.

Our Installation Process

Our installation process involves a thorough insulation assessment, careful preparation, and expert installation of blown insulation into wall your wall cavities.

1. Preparing Your Walls

We start the installation process by drilling small holes in your walls through which we blow blown insulation. Don’t worry, these holes are easily patched and repaired once the installation is complete.

2. Blowing Insulation

Once the walls are prepared, we use specialised equipment to blow insulation into your wall cavity. We install it to such a high density that it’s never going to slump or shrink inside your walls.

3. Finishing Touches

Once all your walls have had insulation installed, we go through a repair process to ensure your house is weathertight. The installer will patch any holes in the wall and sand it down ready for a fresh coat of paint.

What Wall Types Can Be Insulated?

Blown insulation can be installed into most external and internal walls. If your wall type is not listed here, we can probably still help. Give us a call to have a chat about your needs.

  • Brick

  • Weatherboard

  • Fibre

  • Stucco

  • Internal Plasterboard

  • Midfloor

Benefits of Wall Insulation

Insulating your home offers numerous advantages, enhancing overall comfort and health. Key benefits include:
  • Warmer & Drier Home
  • Save on Energy
  • Reduced Heat Loss
  • Less Risk of Illness

Product Technical Information

We use the CosyWall blown insulation system to provide effective thermal insulation for external timber framed wall cavities. It’s suitable for most for older New Zealand with fixed internal linings.

For a total R-value of:Requires material R-value of:Min thickness (mm)
2.2 (1)


2.6 (2)


3.3 (3)


1) Weatherboard >1950 with nogs. Deduct R0.2 if Sheet cladding.
2) Weatherboard <1950 510c/c, no horizontal nogs
3) Brick with 40mm cavity, no building paper

Total R-values assume 18% thermal bridging as per H1/AS1 & may alter in walls with more or less framing timber.

Frequently Asked Questions

Get all the information you need to make an informed decision – explore our FAQ section and find answers to your most pressing questions about CosyWall Insulation and wall insulation in general.

CosyWall is Codemark Certified – What does this mean?

CosyWall insulation has Codemark certification and what this means is that we’ve been through all the steps involved in proving to the government that our CosyWall System complies with the building code.

Codemark certification helps provide you peace of mind that when you choose CosyWall Insulation, it is a durable, long-lasting product that will be installed by qualified experts. The system is continually reviewed through regular auditing and testing procedures giving you the reassurance that the installation will be done to the highest quality standards.

How does CosyWall Insulation work?

The simplest way to describe how CosyWall insulation works is by using the example of a chilly bin effect.

Typically in a home, you have a lid (the roof insulation). and a base (the floor insulation) and all your homes heat passes out through the walls. CosyWall insulation completes your home’s thermal envelope by adding a barrier to the walls of your home, allowing your home to retain its heat.

Will CosyWall shrink or slump over time?

The great thing about CosyWall Insulation is that we install it to such a high density that it’s never going to slump or shrink inside your walls.

CosyWall is based on European technology and is proven overseas as well as in New Zealand. The product is not going to deteriorate over time, and once it’s in your walls, it’s there to stay. It will continue performing day in, day out and will never cost you a cent to run.

The result is a much warmer, healthier home that you’ll love to live in!

Talk to the team today about having CosyWall Insulation installed into your home.

How easy is CosyWall to install?

CosyWall Insulation is very easy to install into the homes. If you install a segment product, you usually have to remove all the linings of your home to install it. This can be a costly process and take a long amount of time to install.

With CosyWall the installation is very simple. It’s blown into your walls through small holes from either the interior or exterior of your home depending on your preference. When we’re done we seal up all the holes and once we’re finished you’ll never know we were there.

What is an R-value rating?

We often get asked about R-values in CosyWall. An R-value is simply a measure of a thermal resistance of an insulation product. The higher the number the better it will retain heat inside your house.

CosyWall Insulation has the highest R-value that’s obtainable in this type of product and is equivalent to the top batts and blown insulation products available in New Zealand.