This insulation system is designed to provide the user with an energy efficient building envelope and a durable finished look. The patented metal purlin clips attach to the purlinsor wall girts and holds the PVC clip to accept the 1¼-inch thick DuraPanel-P panel thus forming a cavity between the exterior metal and the insulation, preventing condensation. The flexible edge seals to the face of the panel and makes the finished surface a viable vapor barrier. The surface of the panel has a class I/A ASTM-84 for flame spread and smoke development.