Abstract: A construction system is disclosed utilizing a prefabricated plank which can be assembled in contiguous, aligned relationship with other similar planks to form a construction section. The individual planks are of varying geometric shapes and are of a composite construction having a structural core with a flexible membrane covering. The core may be formed from foamed plastic, concrete or the like and the membrane a flexible plastic or light gauge metal. The membrane covering includes an edge flap portion adapted to overlie the marginal edge of the next adjacent plank to provide a continuous weatherproof seal between planks. The flaps are sealable by flexible fasteners carried on the membrane flap and marginal portion in the form of interlocking rib and groove elements.

Abstract: A prefabricated panel system which can be erected to form a watertight surface suitable for use as the roof or wall of a building is disclosed. Each panel of the system includes a structural portion having a flexible membrane covering, a foam center member, a corrugated metal panel extending beyond the foam center and the surface of the panel assembly, and elongated, flexible fastener halves disposed along each edge of the flexible membrane. The panels are assembled together in edge-to-edge relationship with the fastener halves engaged to provide a continuous waterproof membrane extending across the joint between adjacent panels. Interstitial regions defined by the junction of adjoining panels are sealed to complete the waterproof membrane. This seal is provided by a viscous adhesive sealing material which is caused to flow into the interstitial regions by compressive means.