ARC insulated DPC has been developed to close off cavities around window and door openings. This closer should be fitted in conjunction with a return block and has an integrated DPC to prevent moisture penetration. This insulated DPC will also help to prevent cold bridging around openings. ARC insulated DPCs are easy to install as the brickwork progresses before the window or door is installed, with the DPC sitting against the outer brickwork to prevent moisture penetration.