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A composite building panel including a central body, substantially parallelepipedic in shape, comprised of an expanded polymer matrix, having opposite faces, a first surface and an opposing second surface; and one or more reinforcing members longitudinally extending across the central body between s

A composite building panel including a central body, substantially parallelepipedic in shape, comprised of an expanded polymer matrix, having opposite faces, a first surface and an opposing second surface; and one or more reinforcing members longitudinally extending across the central body between said opposite faces, having a first side portion embedded in the expanded polymer matrix, and a second side portion extending away from the first surface of the central body and one or more expansion holes located in the reinforcing member between the first side portion of the reinforcing member and the first surface of the central body. The central body includes a polymer matrix that expands through the expansion holes; and a space defined by the first surface of the central body and the second side portion of the reinforcing members is adapted for accommodating utilities through the space.

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1. A composite building panel comprising: a central body, substantially parallelepipedic in shape, comprised of an expanded polymer matrix, having a first surface and an opposing second surface; andone or more reinforcing structural elements longitudinally extending across the central body having a

1. A composite building panel comprising: a central body, substantially parallelepipedic in shape, comprised of an expanded polymer matrix, having a first surface and an opposing second surface; andone or more reinforcing structural elements longitudinally extending across the central body having a first side portion embedded in the expanded polymer matrix, and a second side portion extending away from the first surface of the central body and one or more expansion holes located in the reinforcing structural element between the first side portion of the reinforcing structural element and the first surface of the central body;wherein the central body comprises the polymer matrix that expands through the expansion holes; and a space defined by the first surface of the central body and the second side portion of the reinforcing structural elements is adapted for accommodating utilities through said space, andwherein the one or more reinforcing structural elements comprise a stud selected from the group consisting of: C-type stud; CT-type stud; and CC-type stud. 2. The composite building panel according to claim 1, wherein the central body has a male end and a female end. 3. The composite building panel according to claim 2, wherein the male end of the central body comprises a tongue edge and the female end of the central body comprises a female groove edge that facilitates a tongue and groove union between a first central body and a second central body to form one or more combined composite building panels. 4. The composite building panel according to claim 1, wherein the central body has a thickness measured as the distance between the first surface and the second surface of from about 0.75 inches (about 2 cm) to about 8 inches (about 20 cm). 5. The composite building panel according to claim 1, wherein the central body comprises openings extending along the length of the central body. 6. The composite building panel according to claim 5, wherein the openings have a cross-sectional shape selected from the group consisting of round, oval, elliptical, square, rectangular, triangular, hexagonal and octagonal. 7. The composite building panel according to claim 1, wherein the expanded polymer matrix comprises one or more polymers selected from the group consisting of homopolymers of vinyl aromatic monomers; copolymers of at least one vinyl aromatic monomer with one or more of divinylbenzene, conjugated dienes, alkyl methacrylates, alkyl acrylates, acrylonitrile, and/or maleic anhydride; polyolefins; polycarbonates; and combinations thereof. 8. The composite building panel according to claim 1, wherein the polymer matrix comprises carbon black, graphite or a combination thereof. 9. The composite building panel according to claim 1, wherein the reinforcing structural elements comprise a material selected from the group consisting of construction grade plastics, composite materials, ceramics, and the like. 10. The composite building panel according to claim 1, wherein the polymer matrix comprises an interpolymer of a polyolefin and in situ polymerized vinyl aromatic monomers. 11. The composite building panel according to claim 1, wherein the reinforcing structural elements comprise a metal selected from the group consisting of aluminum, steel, stainless steel, tungsten, molybdenum, iron and alloys and combinations of such metals. 12. The composite building panel according to claim 1, wherein one or more surfaces of the reinforcing structural elements have a texturized surface. 13. The composite building panel according to claim 1, wherein the embedded first side portion of the reinforcing structural elements extends through the first surface and second surface of the central body. 14. The composite building panel according to claim 1, wherein the reinforcing structural elements further comprise one or more utility holes located in the reinforcing structural element between the first surface of the central body and the second side portion of the reinforcing structural element and are adapted to receive utility lines in a transverse direction relative to the reinforcing structural elements. 15. The composite building panel according to claim 1, wherein the utilities are one or more selected from the group consisting of water lines, waste lines, chases, telephone lines, cable television lines, antenna lines, electrical lines, ductwork, and gas lines. 16. The composite building panel according to claim 1, wherein the expansion holes have a cross-sectional shape selected from the group consisting of round, oval, elliptical, square, rectangular, rounded rectangular, triangular, hexagonal, parallelogram, oblong, octagonal and combinations thereof. 17. The composite building panel according to claim 1, wherein said reinforcing structural elements comprise metal studs. 18. The composite building panel according to claim 1 further comprising a bottom track, having a bottom and sides, adapted to receive a bottom portion of the composite building panel. 19. The composite building panel according to claim 3, wherein a bottom track and a top track are attached to a bottom end and a top end respectively of the combined composite building panels. 20. The composite building panel according to claim 19, wherein said top track is configured to facilitate movement of said combined composite building panels relative thereto when said combined composite building panels are attached to said top track. 21. The composite building panel according to claim 19, wherein the bottom track has a holding capacity of from 0.2 to 1 ft3. 22. The composite building panel according to claim 1 made by continuously or semi-continuously molding a foamed plastic central body with two or more reinforcing structural elements partially embedded therein. 23. A method of constructing a building comprising: providing a foundation having a series of foundation walls having top surfaces;supporting a plurality of composite building panels, each of the composite building panels according to claim 1, adapted for use as a floor unit, on at least some of the top surfaces of the foundation walls;positioning and securing two or more of the plurality of composite building panels according to claim 1, adapted for use as a wall unit, to at least part of a top surface of the floor unit, wherein a bottom track and a top track are attached to a bottom end and a top end, respectively, of each of the composite building panels; andpositioning and securing the composite building panels according to claim 1, adapted for use as a roof unit, to at least some of the top tracks of the wall units. 24. A building constructed according to the method of claim 23. 25. A building comprising one or more of the composite building panels according to claim 1.