More heat is lost through walls than by any other route. If your home is not insulated, your walls are responsible for as much as 35% of all your lost heat.
There are generally two kinds of external walls, solid and cavity. If your home was built after the early 1930’s you probably have cavity walls. That means your walls have an inner and an outer layer with a small air gap or ‘cavity’ in between.
Cavity wall insulation is always done by a professional installer, who uses specialist equipment to inject insulating material from outside into the cavity by drilling small holes in the wall.
Various types of insulating material can be used – foam, mineral wool (rock or glass) or polystyrene beads. The cost depends on the type of material used and the size of your house.
Further information about the schemes that are available to help with the installation of cavity wall insulation.
Contacts
Energy Saving Trust Advice Centre for London
Telephone: 0800 512012
E-mail: advice@est-london.org.uk
Website: www.energysavingtrust.org.uk/london