Installers should be investigated by the Serious Fraud Office, an influential parliamentary committee has said.

Solid wall insulation is an extra layer of insulation on an external or internal wall, while cavity wall insulation is injected into the space between the two layers that make up the external walls.

Add Yahoo as a preferred source to see more of our stories on Google. Neighbors cover their ears to muffle noises coming through the thin walls of their home. While it’s fun to speculate on “if these ...