What Is Cavity Wall Insulation & How Can It Help?

One of the most cost-effective ways to improve the energy efficiency of a property is by installing cavity wall insulation.

Cavity walls are likely to feature in most houses built after 1920, and if the house was built in the last 10 years then they are more than likely already insulated. But not all properties with cavity walls are suitable for this installation, for example, those regularly exposed to wind-driven rain.

How Cavity Wall Insulation Works?

Cavity wall insulation works by filling the gap between the two layers of the external wall, this is normally done with a foam spray. A registered installer will be required to do this and can check the property’s suitability for the installation beforehand.

If a property is suitable, the insulation is blown into the cavity through a drilled hole in the exterior brick wall. Each hole is around 22mm in size and spaced at intervals of around 1m. Every part of the wall must be filled with insulation and the process can take around two hours depending on the size of the property. Installing the insulation should be simple, quick and make no mess.

Cavity Wall Insulation Benefits!

Installing cavity wall insulation can contribute to savings of up to 35% of all heat loss from your home. The insulation can be made from mineral wool, beads or granules, and foamed insulants. All three types are manufactured to British standards; however, foam insulation must be certified by the British Board of Agrement.

Further information on cavity wall insulation can be found on the Energy Saving Trust website and on the Which? website.