OSB or oriented strand board is an engineered wood panel made up of resin bonded wood strands or flakes. The wood strands are cut and oriented in order to produce a wood panel with uniform strength and density. Like plywood is suitable for use as a structural board and is commonly used in wall and roof sheathing and also used widely in subfloors. OSB is made of long wood strands and should not be confused with particle board which is made of fine wood fibers.

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