Abstract: A foam roofing system in which a unique universal beam allows adjacent foam roofing sections to be joined and substantially eliminates water leaks. The universal beam is formed with a design that creates a series of water dispersing channels on either side of a center web and a third concave channel on a surface opposite the channels. Adjacent roofing panels are joined by two of the universal beams on upper and lower surfaces with the beams being in reverse orientation. The beam thus provides a series of at least three separate channels for dissipating excess water. The system also includes a unique coupling splice for joining joists, or cross beams, that support the roofing system. The splice coupling has stiffening ribs to prevent collapse of hollow sheet metal joists when bolted together. The universal beam also accommodates transparent panels to allow the roofing system to include a skylight, if desired.

Abstract: A modular greenhouse construction in which panels are prefabricated from a universal beam or mullion and the panels are interlocked to form walls and a roof. The universal beam has a spline receiving groove in one surface and a ribbed channel in the surface opposite with C-shaped slots on either side of the beam for interlocking the two panels. Joints are formed by L-shaped inserts engaging an interior channel in the beam with the particular angle of the joint being determined by the shape of the insert. For 90.degree. corner joints, the insert would, of course, be a 90.degree. L-shape. An enclosure is formed by securing adjacent panels with an H-shaped insert engaging abutting C-shaped slots on the periphery of each panel. Caps which snap on the frames are provided to form corners for the building and a gabled roof.