Around a third of all heat lost from a poorly insulated home escapes through the walls, which means installing cavity-wall insulation is often one of the ... Only logged-in Which? members can view our ...

Cavity wall insulation The gap between two brick walls is filled with material that has a lower thermal conductivity than air. This is because it contains trapped air which cannot transfer energy ...

Cavity Extraction, the UK’s only company dedicated to identifying and removing inefficient cavity wall insulation, has been honoured with the prestigious Lancashire Business View Award at the ...