Studies have proven that cavity wall insulation is the single most effective insulation measure which can be taken for all residential and commercial buildings, and can reduce heating costs by up to 33%. At Ecowise we stock both KOREfill and Certainfil – by using both suppliers we can ensure our customers the best deal and the most timely service. Physical Properties Both KOREfill and Certainfil are types of cavity wall insulation which utilise two basic components. These components are a specially manufactured grade of closed cell polystyrene FRA thermal bead, which is coated with an air drying adhesive during the injection process. This special bonding agent allows the beads to flow freely until the cavity wall is completely fitted. The adhesive then sets, forming the beads into a bonded homogeneous heat saving mass which will not shrink, crack, settle or be unduly affected by the removal of any of the outer brickwork for alterations or window replacement. Both Korefill (IAB certific