When evaluated under standard structural load conditions and certified building code standards, 3/4-inch Oriented Strand Board and 3/4-inch structural plywood exhibit comparable stiffness and load-bearing capacities for subflooring and roof decking. OSB often provides more uniform transverse strength across the entire sheet due to its multi-layer cross-oriented strand matrix, whereas plywood strength can vary slightly depending on veneer grain direction. However, plywood generally retains superior screw-holding strength, better moisture resistance, and less edge-swelling compared to OSB when both materials are subjected to heavy loads over extended periods.
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