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Blown Insulation FAQ

Your Comprehensive FAQ Guide to Blown Insulation Solutions in New Zealand.

Acoustic Insulation Benefits for cavity walls


As much as 35% of your homes heat can be lost through the walls therefore insulating your walls represents one of the best ways to improve the energy efficiency of your home to save money and also get the acoustic insulation benefits.

In most New Zealand houses there is a gap between your interior walls and external cladding. This gap or cavity can be filled with insulating material to stop the heat conducting through the walls to the outside air. In short, this can save a lot of energy and money. By filling this cavity you also gain the acoustic benefits. This helps to reduce noise from external sources including cars, planes or even just noisey neighbours.

Cavity wall insulation (cwi) is installed by professionals usually from the outside by drilling small holes in the wall and injecting loose insulating particles which settle to fill the cavity in your wall. Once complete, the drilled holes are filled again with minimal change to the aesthetics of the wall. A three-bedroom, semi detached home can be insulated in less than three hours by a trained installer. It’s quick, clean and doesn’t affect the structure or look of your house. Acoustic insulation can also be installed to internal walls to reduce noise between rooms.

The same acoustic insulation benefits can be gained by insulated mid floor cavities. This helps to reduce noise transfer between floors. This type of acoustic insulation is most effective with low to mid frequency noise such as voices or televisions. When undertaking this type of installation it is imperative to consider all factors. This will include the timber framing and layout, any recessed lighting and the flooring substrate.