Cavity Wall Insulation

What is cavity wall insulation?

Cavity wall insulation (CWI) is a type of insulation inserted into the space inside the walls of a property – the cavity. Cavity walls are formed by two walls of brickwork built close together, between which the insulation is injected.

Most homes built after 1920 have cavities, whereas older homes tend to have solid walls. More modern properties are usually constructed with a layer of insulation boarding between the walls, especially if they have been built in the last 20 years.

There are many types of CWI for different property types, including: mineral wool, bead, or foam. Some CWI materials may not suitable for every cavity (especially if they are uneven or narrow), therefore a specialist survey is required to determine suitability.

Insulating your cavity walls can save up to £150 per year on your heating bill if you live in an average semi-detached house.

Cavity wall insulation Scotland

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