Cavity Insulation - Summary
Most houses built after the 1930s have cavity walls - space between the outer wall and the inner walls of your home. With a cavity wall injection, the space is filled so that you have better home insulation (cavity wall insulation). So your cavity wall injection can help to improve energy efficiency and significantly reduce your heating bills. Cavity wall insulation or dry lining insulation is affordable and only takes a few hours to install.
What is a cavity injection? - How much can you save with cavity wall insulation? - Cavity Wall Insulation