Cavity wall insulation is removed by creating controlled access points to the external wall. Small access holes are drilled, and bricks are removed just above the damp proof course (DPC) level to allow full access to the cavity. Compressed air is blown through the cavity to loosen the insulation, which is extracted at exit points at DPC level using an industrial vacuum system. Insulation is also removed below DPC level to prevent future moisture from tracking across insulation between the external and internal wall skins. Once removal is complete, the cavity is inspected, cleared where necessary, and all access points are professionally reinstated to match the existing wall finish.