Abstract: A building structure such as, for example, a door or window jamb, is provided having outer solid wood members secured together around a LSL core which provides uniform moisture and density and which remains within dimensional and tolerance requirements. The multi-directional placement of wood fibers in the LSL core allows for a uniform binding of wood composite components to all flat surfaces and allows for any change in moisture content causing shrinkage or swelling in all directions reducing twisting or cupping. The LSL core provides a product that has a lesser weight per volume and is easier to handle and move to the point of installation within the building. The multi-directional fibers of the LSL core further provides greater screw holding capabilities and carrying ability than prior core products.