Removes boards from sorting table, hand truck, or conveyor and stacks in piles or places boards in rack or on conveyor, according to grade marking, length, or use of boards. Gauges length of boards by sight, by marks on sorting table, or by measuring with rule. May also remove defective lumber from conveyor and stack lumber according to grade, length, species, and color. Places sticks between layers as stack rises to permit circulation of air and bind stack together. Loads and unloads stacking machine, working in teamwork with other workers.