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Cavity wall insulation consists of Mineral wool, EPS bead, or PU foam pumped throughout the wall cavity between the outer and inner brick walls of your house. This can reduce internal draughts, and depending on the type of house you own, save you around 325 kg (flat), 415 kg (mid-terrace), 440 kg (bungalow), 660 kg (semi-detached), and even up to 1100 kg (detached house) of carbon emissions per year.

Source: Energy Savings Trust