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Spaced, opposed plywood sheets having kerfs in their peripheral edges are integrally joined by S-shaped aluminum bars that join the edges of the plywood sheets to form panels. Each bar is provided with spaced, elongated splines that interfit into the kerfs and are adhesively bonded therein. The bars

Spaced, opposed plywood sheets having kerfs in their peripheral edges are integrally joined by S-shaped aluminum bars that join the edges of the plywood sheets to form panels. Each bar is provided with spaced, elongated splines that interfit into the kerfs and are adhesively bonded therein. The bars are welded together to form an integral border frame. Each S-shaped bar includes an outwardly facing groove or protrusion and a duct joined by a common wall. The top bar and one side bar of the border frame are turned end for end relative to the bottom and opposite side bars so that the duct of a bar forming a border frame of an adjacent panel will interfit into the groove of the bar forming the border frame of the first panel. In this manner a continuous wall of interfitting panels may be constructed. Various forms of bars are provided to interconnect other building components such as beams, windows, doors and the like, with the panels. Also described is a beam formed of two or more load bearing members each having lengthwise kerfs along their opposite edges. The load-bearing members are joined by a pair of elongated aluminum bars also having integral splines which are adhesively bonded in the kerfs.The interconnectable border frames with protrusions and grooves are also provided in an improved wooden form for panels which can be combined to form the essential roof, walls, and floor components of a complete building. The floor and wall panels uniquely provide for selectivity in the location of the floor panels along the vertical height of the wall panels.

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