We can also provide you with accurate and up-to-date information relating to Government insulation / energy efficiency improvement grants & funding. Cavity Wall Insulation fills the gap in between the bricks of your walls. Modern cavity wall insulation is an expanded polystyrene bead that is bonded together during installation. Installing cavity wall insulation is like putting a warm blanket on your house. The insulation keeps the heat in, meaning that you can have your central heating on for less time, or turn in down to a lower level. Loft insulation is essential. Heat rises in your home and escapes quickly through your loft or attic and out the roof. Loft insulation makes it increasingly difficult for heat to pass through the roof, trapping the escaping heat.