Engineered sheet goods take one giant step farther down the road paved for them by plywood. Plywood is an assembly of alternating wood veneers that run perpendicular to each other, bonded with an adhesive. Originating in the 19th century, its production grew slowly until World War I; increased in the twenties with its use in airplane and auto manufacture as well as building; and finally exploded during and after WW II (Jester, 1995). Especially in the early days, large diameter peeler logssometimes over 5 feet/1500mm. widewere required. In the seventies, waferboard made its appearance, followed by oriented strand board (OSB) in the eighties. Both could be made from smaller trees of species of little commercial value. A weaker material, waferboard disappeared from the scene, but OSB has captured half of the North American market for structural panels and is still expanding it dominance (Wilson & Malin, 1999).