Technical

The main insulation materials used are glass or mineral fibre that is chopped up and blown into the cavities. Some installers use Bonded bead (white polystyrene beads) and Urea formaldehyde foam (white foam).

All systems have been tested, assessed and approved by the British Board of Agrément or the British Standards Institution. The installer can confirm to you what products they use.

The material is guaranteed for 25 years against any defects. Guarantees are provided by the Cavity Insulation Guarantee Agency - CIGA.

If your home was built before 1935 the walls may not have a cavity or they may not be suitable to insulate. If your home was built from 1989 onwards, it was required to be insulated under the Building Regulations at the time of build. This may be with modern insulation or with Thermal Blocks. There is no funding available for cavity wall insulation for post 1989 properties under the Green Project.