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Oriented Strand Board (OSB) is an engineered wood product made by compressing layers of wood strands (flakes) with adhesives, under heat and pressure.

OSB is formed by aligning wood strands in specific orientations—outer layers are generally aligned longitudinally, while inner layers are cross-oriented or random—to enhance strength and stability. It’s produced from fast-growing, small-diameter trees like aspen, poplar, pine, or spruce, making it a sustainable alternative to plywood.