- Cavity wall insulation
Cavity wall insulation is used to reduce
heat lossthrough a cavity wallby filling the air space with a porous material. This immobilises the air within the cavity (air is still the actual insulator), preventing convection, and can substantially reduce space heating costs.
During new build, cavities are often filled with
glass fibrematting placed between the two leaves of the wall, but many other building insulation materialsoffer various advantages and many others are also widely used. For existing buildings that were not built with insulated cavities, a fibrous material such as celluslose insulationis blown into the cavity through suitably drilled holes until it fills the entire wall space, or foam is injected. Although some foams used in the past, such as urea-formaldehyde, are no longer used (some people allergic to this material, which is very difficult to remove once inside the wall), others such as polyurethane, have taken their place.
United Kingdom, government grants are widely available to help with the cost of cavity wall insulation.
* [http://www.ciga.co.uk/ Cavity Insulation Guarantee Agency]
* [http://www.bbacerts.co.uk/ British Board of Agrément]
* [http://www.thinkinsulation.co.uk/cavity-wall-insulation.htm Cavity Wall Insulation Guide]
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