joists and planks
Isaac Kremer/ September 9, 2018/ / 0 comments
Structural lumber of rectangular cross section, from 2 to 4 inches (51 to 102 mm) thick and more than 4 inches wide, graded primarily with respect to bending strength when loaded either on the narrow face as a joist or on the wide face as a plank. (Ching, 1995)