CosyWall Insulation (CWI) is an external wall cavity insulation system (EWCIS) designed to insulate the walls of older homes. It provides thermal and acoustical insulation to existing wall cavities and is installed without the cost and hassle of removing the internal linings. Installation is done via small holes through the external cladding, or from inside via holes in the internal linings. The result is high installed R-values and a warm cosy home. CosyWall insulation has been successfully growing since 2002 based on three core principles;

- Using a Great Product.
- Developing Proven Methods.
- Ongoing Training and Auditing.

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why choose
existing wall insulation

  • Cavity wall insulation saves money and our nations limited energy resources.
  • CosyWall is non-combustible
  • External wall insulation can make your home warmer, drier, healthier
  • High installed R-values in comparison to other exterior wall insulation.
  • CosyWall is NZBC compliant and CodeMark certified
  • CosyWall is safe and has no added formaldehyde
  • CosyWall is a dry fibre existing wall insulation system that utilises water repellent glasswool insulation
  • CosyWall will not shrink or settle over time
  • Available nationwide through our specialist retrofit wall insulation resellers
  • Proven New Zealand history of use.
  • Fills up the gaps that are often left by a blanket or segments.

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wall insulation
news and blog

External Walls Suck

External walls are responsible for sucking up to 35% of the heat loss from your house.  So insulating just the roof and underfloor and leaving the walls uninsulated is crazy. CosyWall provides a simple cost effective solution, by installing external wall insulation without having to remove external cladding or internal linings. You’ll be cosy year […]

CosyWall – The Cavity Wall Insulation Experts

CosyWall is a cavity wall insulation system designed to deliver excellent INSTALLED performance, rather than just stating misleading ‘bale’ R-values. CosyWall is manufactured by one of the worlds best insulation material manufacturers. The product is tested to ensure the material’s suitability for local conditions and this material, combined with the CosyWall installation system is CodeMark […]

Cavity Wall Insulation Options

Cavity Wall Insulation Options Bulk Cavity Wall Insulation Options Before putting in any type of cavity wall insulation into existing walls, it’s important to make sure the building has been assessed by an experienced professional and is suitable for cavity wall insulation. Bulk cavity wall insulation comes as segments or blankets. Segments (batts) are pre-cut […]