Cavity Wall Insulation: You might think you’re all sorted with your ceiling insulation but 50% of your house’s heat escapes through the walls. Don’t despair…there’s a solution! If you have a double brick or brick veneer home, insulation can be piped into the cavity between the brick layers, providing a layer of protection against heat escaping in winter or entering in summer. Even weatherboard homes can be made more comfortable by accessing the gap between timber studs.