Years after cavity wall insulation first became one of the preferred insulation methods of choice, people have started to question the impact that it has on their homes.
Most brick homes built since 1970 in the UK, and certainly many built between 1930 and 1970, have cavity walls. Most of these homes have a cavity of about 2 inches, which is considered the ideal specifications for cavity wall insulation.
In terms of materials, there are three main products to choose from: blown mineral wool fibre, polystyrene beads and urea formaldehyde foam.
Mineral wool fibre is the most common, however, over time, individual fibres come apart, leading to sagging, lagging and air leaks.