Abstract: Modular roof panels having sloped top surfaces and flat bottom surfaces are interlocked in edge-to-edge relation to one another to form a monolithic roof where the roof is pitched to provide moisture run off but where the space covered by the roof has a ceiling that is not pitched. Thus, the side walls of the structure have a common height. In a first embodiment, the top and bottom surfaces of the panels are covered with a skin, and in a second embodiment only the top surface is so covered. The first embodiment is used in original roof construction and the second is used in roofover construction. In both embodiments, the core material is preferably expanded polystyrene and the skin is preferably metallic. The skins are bent to interlock contiguous panels.

Abstract: Modular building panels having foam cores protected by metal skins are releasably interconnected in edge-to-edge relation to one another. The interconnection is accomplished by bending the metal skins that protect the top and bottom surfaces of the core into complementary shapes so that contiguous panels are snap fit together when the bent metal skins are interlocked with one another. In some embodiments, the cores are grooved and the flexibility of the interlocking members is increased by decreasing the depth of the grooves and the flexibility is decreased by increasing the depths of those grooves because decreasing the groove depth provides less support for the interlocking members and allows them to displace more during the interlocking procedure and increasing the depth increases the support and thus limits their movement.