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Cavity wall insulation

Most conventional housing built after 1920 is of brick cavity wall construction. This means that the outer walls are made up of two-brick construction, with an air gap in between them.

This unfilled air gap between the two walls can mean that any heat escapes easily through the walls and into the outdoors, meaning that a large proportion of the heat you use to warm your home is being lost to the great outdoors.

Cavity wall insulation is designed to effectively fill this gap with an insulating material, and is injected into the cavity from the outside of the building. This helps to reduce the amount of heat escaping through the walls, so your house heats up quicker and you can reduce your energy consumption accordingly.

Environmental and cost benefits

Cavity wall insulation is an efficient way to significantly reduce the amount of energy you need to heat your home, while also reducing carbon emissions. The average house could reduce heating costs by a third by installing cavity wall insulation.

Between 2002 and 2005, around 800,000 UK households installed cavity wall insulation, saving a combined estimated total of 400,000 tonnes in CO2 emissions. In fact, if all the houses in the UK with unfilled cavity walls had them filled, the energy saved could heat 1.7 million homes each year.

The installation process

It takes typically as little as two to three hours to insulate a three-bed semi-detached house – and it can cost under £500. The typical payback period for having cavity wall insulation is about three years, so you can make up for the initial installation cost quite quickly and then continue reaping the benefits of significantly lower energy bills.

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