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Cavity wall refers to a double wall separated by a hollow space, known as 'Cavity'. The outer layer wall is commonly constructed of brickwork, whereas the inner layer is built from either bricks or concrete. Brickwork and concrete, are highly absorbent. Thus when it rains, humidity is absorbed into the house. Similarly, heat from within the home is lost. For more information:- https://www.evergreenpoweruk.com/how-to-insulate-walls-without-cavity/

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