An engineered wood structural system including multiple vertical structural elements including first seats comprised between parallel vertical struts made of successive aligned vertical strut segments connected to each other, multiple horizontal structural elements, supported on the first seats, each including an upper horizontal board and a lower horizontal board with at least one second spacer placed in between, and optionally slab members supported on the horizontal structural elements defining at least one structure floor.

A thermal break wood and rigid insulation wall support column, buttress or header is comprised of spaced apart multiple parallel and right angled wood panels. The right angled wood panels are secured together by box joints. Non-metallic angled mechanical fasteners hold the lumber panels together in a truss angled arrangement maintaining the panels spaced relationship. A thermal break section of rigid foam insulation is injected between the lumber panels and around the mechanical fasteners.

E.sup.3Lumber is comprised by novel apparatuses as engineered wood systems, methods, apparatuses, tools, adhesives, and manufacturing for construction of structures. E.sup.3Lumber has standardization and optimization surpassing state-of-the-art construction. Each of those systems, methods, apparatuses, material compositions, and material stratifications utilize one-to-many apparatus relations. All formed or machined apparatuses feature innovative features like engineered constraints, multi-tier and hybrid composites, and constrained assembly all situated within novel methods like, the Three E, 4-Tier, Cross Datum Construction, E-Stud, E-Framing, E-Truss, E-Hips, E-Bridging, Continuous Truss methods meet national and international specifications. The Three E's of E.sup.3Lumber are environmental, economic, and engineering and are characteristics found throughout invention intended for the significant improvement of environmental conditions, wood products, and technologies. As a fact, E.sup.3Lumber use decreases deforestation by increasing growth periods of trees by decreasing biomass consumption and all the while providing economic incentive to become greener.

A hollow elongate building element (1) made of composite wood is described. It has a polygonal peripheral structure (3) around the void. Each side of the polygonal peripheral structure (3) is formed of at least a pair of elongate strips (5) of triangular or trapezoidal cross section, which are juxtaposed and reversed relative to one another. The polygonal peripheral structure (3) also exhibits strip-form butting-together means (7, 9) in its corner regions. The various strips (5, 7, 9), which are obtained by radial cuts into logs, are bonded together.

A bar element as a construction element includes strips preferably produced from bamboo and is hollow at least in certain regions. The hollow interior is formed at least in certain sections as a hollow fillet achieved by a plastic and/or resin introduced into the bar elements, using a shaped body movable through the interior. Producing bar elements from interconnected strips ensures that although produced from a natural raw material, the bar elements have a reproducible outer cross section. Using a shaped body movable through the interior to produce the inner cross section also ensures a defined inner cross section of the bar elements, with the result that in turn connections between a plurality of bar elements that are defined by suitable connection elements can be formed. In this way, the bar elements make it possible to produce lattice works, grid constructions, frameworks or other desired structures and/or three-dimensional bodies.

A prefabricated steel-wood composite joint includes square pipe columns, steel-wood composite beams, and a beam-column connecting assembly for connecting the square pipe columns and the steel-wood composite beams. Each square pipe column includes connecting corner columns and connecting side plates. Each steel-wood composite beam includes a top flange, a bottom flange and wood webs for connecting the top flange and the bottom flange. The beam-column connecting assembly is a central column connecting assembly or a corner column connecting assembly. By a special structural design, the composite joint realizes effective beam-column connection without a welded connection and a bolted connection and has tenacity and good seismic performance. The components of the composite joint can be prefabricated in a factory, are high in precision and are assembled on site, so that construction is easy and convenient, procedures are simplified, and the construction period is effectively shortened.

A prefabricated pole barn including a truss assembly, a foundation assembly and a roof assembly is disclosed. The truss assembly includes specially made trusses made with galvanized square tubing or red iron tubing. The tubing helps to provide the trusses with added strength and stability. The design of the trusses along with a quickset foundation of the foundation assembly, particularly treated floor support poles of the foundation assembly, and a roof of the roof assembly help to provide with a quickly and easily assembled pole barn. The pole barn is further stronger, more stable and loadbearing in comparison to traditional pole barns using standard bar joist trusses made of wood.

A prefabricated steel-wood composite joint includes square pipe columns, steel-wood composite beams, and a beam-column connecting assembly for connecting the square pipe columns and the steel-wood composite beams. Each square pipe column includes connecting corner columns and connecting side plates. Each steel-wood composite beam includes a top flange, a bottom flange and wood webs for connecting the top flange and the bottom flange. The beam-column connecting assembly is a central column connecting assembly or a corner column connecting assembly. By a special structural design, the composite joint realizes effective beam-column connection without a welded connection and a bolted connection and has tenacity and good seismic performance. The components of the composite joint can be prefabricated in a factory, are high in precision and are assembled on site, so that construction is easy and convenient, procedures are simplified, and the construction period is effectively shortened.

A thermal break wood and rigid insulation wall support column, buttress or header is comprised of spaced apart multiple parallel and right angled wood panels. The right angled wood panels are secured together by box joints. Non-metallic angled mechanical fasteners hold the lumber panels together in a truss angled arrangement maintaining the panels spaced relationship. A thermal break section of rigid foam insulation is injected between the lumber panels and around the mechanical fasteners.

A sustainable building material and system comprising of panels with alternatively oriented spacers and with panel connectors, panel edges and composites thereof. It is manufactured from semi-material in two manufacturing operations; the first manufacturing the panels, panel connectors and edges and the second manufacturing sub-assembles or composite elements from these. The building material and system are suitable for manufacture and assembly at various levels of technology and investment, and are designed for efficiency in manufacture, transport and offsite and onsite assembly.