During construction of new buildings, cavities are often filled with glass fibre wool or rock wool panels placed between the two leaves (sides) of the cavity wall.
For existing buildings that were not built with insulated cavities, a fibrous material such as cellulose insulation or glass wool or polystyrene balls is pumped into the cavity through suitably drilled holes until it fills the entire wall space.
Foam can also be used to fill the gap. Although some foams used in the past, such as urea-formaldehyde, are no longer suitable (some people are allergic to this material), others, such as polyurethane, have taken their place.
The data we use to work out energy and water costs come from a range of reliable international sources to give an average figure. Figures are rounded up or down to the nearest whole number.
* Total amounts potentially saved do not include lighting in individual rooms, or use of secondary heating.
EcoFrenzy has researched the market and to the best of our knowledge, figures and data are accurate at the time of publication.
EcoFrenzy is not responsible for any inaccuracies and will not engage in correspondence, but will update facts and figures when necessary or appropriate.