What is it and how will it be installed?

hi cavity wall insulation is a chemical that they inject through the wall from the outside to fill the cavity. they will drill small holes and inject through them then fill the hole. a 3 bedhouse should be a quick job less than a day

Cavity wall insulation is not a chemical injected into the wall, that is a dpc. Cavity wall insulation is fitted to inner walls during build, there are many types and thickness, can be part or full fill, normally held in place by plastic discs on the wall ties If fitted after then this is usually blown into cavties, via drilled holes. If you are talking about a chemical damp course then complete building is correct, they are also using a cream as well of chemicals

Cavity wall insulation is a new and perfect way of insulating your home. It is a chemical that is put in the cavity of your facing brick and partition/blockwork by drilling small holes over the face of your building. Please note that holes will be filled but decoration will be needed after holes are filled e:g painting/render.