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Wall Insulation

Understand the value of blown wall insulation, a game-changer in New Zealand home insulation solutions.

What is Blown Wall Insulation?

Blown insulation is a great insulation option for kiwi homeowners. It can be used to quickly insulate the walls of a new build, or improve the insulation of older, under-insulated homes and buildings.

Blown insulation consists of tiny, confetti-like material fragments or fibres blown into walls and attics using a long hose. This process is advantageous because it’s able to fill small gaps and spaces, creating an insulating blanket that reduces thermal and acoustic transfer between the outdoors and indoors.

Are there different types of blown wall insulation products?

Yes, The three main types of blown-in insulation available in New Zealand. These are loose-fill fiberglass, cellulose, and rock wool. All are great products however vary in composition, thermal value, and environmental impact. Here’s an overview of the main types of blown wall insulation products available in NZ.

Loose-fill Fiberglass Insulation

Produced from liquefied and spun glass, this lightweight insulation material offers higher thermal R-Values when compared to a typical batt or segment product. Blown fiberglass insulation is manufactured from up to 80% recycled glass content. The largest manufacturer of loose-fill fibreglass products in New Zealand is Knauf Insulation. 

Loose-fill fibreglass is the primary form of blown insulation in New Zealand and is widely used by the leading wall insulation systems like CosyWall Insulation.

Loose-fill Cellulose Insulation

Loose-fill cellulose insulation is an eco-friendly option popular among homeowners, which utilises finely shredded recycled cardboard or newspaper as its base material. Chemically treated to prevent mould and withstand fire, it offers both effective insulation and peace of mind in terms of safety. One downside to consider, however, is its susceptibility to moisture; if cellulose insulation gets wet due to leaky roofs or pipes, it can compress and lose its insulation efficiency.

Rockwool Blown Insulation

ROCKWOOL Insulation Granulate is also a blown-in insulation product. It’s a stone wool insulation which is fire resilient, robust and recyclable. It provides good thermal R-Values however tends to be denser and heavier than other forms of blown insulation.

The product  can be applied in a range of areas but is particularly useful in roof and and wall spaces and can fill up gaps and voids often left by other traditional insulation products.

Installer blowing wall insulation from inside

Advantages of Blown Wall Insulation

  • Creates wam and healthy homes
  • Can be installed without the need to remove linings

  • Provides high thermal performance

  • Reduces noise transfer from inside and outside the home.

  • Helps reduce your home’s energy useage

Need some help?

If you’ve got questions about blown wall insulation products we would be happy to chat. Drop us an email at or call us on 0800 267 992 for a conversation.