Oriented strand lumber (OSL) is made from flaked wood strands with a high length-to-thickness ratio. The manufacture of OSL also represents the efficient utilization of wood resources because it makes use of strands from fast-growing and underutilized species. The strands are oriented and combined with an adhesive to form a large mat or billet and then pressed. OSL is used in a variety of applications such as studs, beams, headers, rim boards and millwork components.
The strands used in OSL are shorter than that used in LSL. Both LSL and OSL offer good fastener-holding strength.