Cavity wall insulation can be a great way of improving the thermal performance of a building, making it both warmer and cheaper to heat, but it’s not always a suitable solution. We explore the pros and cons. 

What are cavity walls?

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.

How can I tell if a wall is a cavity wall?

There are often clues on whether a structure has a cavity wall to be found by looking at the exterior brickwork. Typically ‘long’ bricks denote a cavity but a mixture of…

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