Fitting insulat i on for cavity walls is among the quickest and most cost-effective ways to improve energy efficiency. Whether its slabs for new build s and extensions, or granulate for renovations.. Materials with strong thermal insulation properties are key to delivering effective external walls 2. An uninsulated cavity will cause a lot of heat loss during a cold period.. Cavity walls are exterior walls with a gap in the middle and is generally found in houses built after 1920 (though there are exceptions to the 'rule'). The outer leaf is usually made of brick with inner layers either constructed from brick or concrete blocks. The gap can be filled with insulation to improve the thermal performance of a building.

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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.. A cavity wall is made up of two walls with a gap in between, known as the cavity; the outer leaf is usually made of brick, and the inner layer of brick or concrete block. Pre-1920 older houses are more likely to have solid walls. A solid wall has no cavity; each wall is a single solid wall, usually made of brick or stone.