Cavity/Party Wall Insulation

Cavity Wall Insulation (CWI) is an approved Green Deal and ECO measure under the Building Fabric Measures category.

What is Cavity Wall Insulation?

The majority of houses which were built in the past 100 years were built with two layers of wall which left a small space between the two walls, known as a ‘cavity’. The thought behind leaving the cavity is to protect the inside wall of the property by providing another layer for rain water and anything else which over time could damage the wall, to get through. However, unfilled cavities let heat escape and in some cases the cavity could be the cause for around 35% of heat lost from the home.

Cavity Wall Insulation is used to reduce heat loss through a cavity wall by filling the air space with a porous material. This immobilises the air within the cavity, (air is still the actual insulator) preventing convection, and can substantially reduce space and heating costs.

During construction of new buildings, cavities are often filled with glass fibre wool or rock wool panels placed between the two leaves, (sides) of the wall, but many other materials offer various advantages and many others are also widely used. For existing buildings that were not built with insulated cavities, a fibrous material such as cellulose insulation or glass wool is blown into the cavity through suitably drilled holes until it fills the entire wall space. Foam can also be used for this purpose.

Cavity Wall Insulation can also reduce condensation which in time will help prevent damp problems within the home, can increase the value of a home whilst reducing the cost of energy bills and carbon emissions.

Green Deal Home Improvement Fund

Cavity Wall Insulation is also a measure under Core 1 of the Green Deal Home Improvement Fund where homeowners can recoup 100% of the installation cost of Cavity Wall Insulation up to £1,000 along with £100 for the Green Deal Assessment and another £500 if they have recently moved home.

For further information on Green Deal Certification for Cavity/Party Wall Insulation, please contact our team on 0124 478 4260. Alternatively please email us at enquiries@easy-greendeal.com.