7/16 in. OSB (Oriented Strand Board), 4 ft. x 8 ft. square-edge roof and wall sheathing is ideal for the construction of residential single and multi-family houses, as well as light commercial construction and modular mobile homes. OSB's flakes are arranged in cross-oriented layers with the help of waterproof adhesives. The result is a structurally engineered wood panel similar to plywood in strength and performance, but more uniform and less expensive.