1) Boards that were sawn as opposed to riven.
1485 ij flekes pro plaustro xd. sawane bordes, viijs, Ripon
1510 all necessary wood to his husbandry geare … except sawne timber for the body of their waines, Shitlington
1558 all my tymbre lying … within my croft … and all my sawen bords, Hunshelf. See sagen, sarking boards.