While every effort has been made to insure the accuracy of the information presented, and special effort has been made to assure that the information reflects the state-of-the-art, neither the West Coast Lumber Inspection Bureau, the American Wood Council nor its members assume any responsibility for any particular design prepared from this Online Span Calculator.
When cutting the ceiling joists, measure the cut lines 1/8" more from the plate on each end, make sure the sawsall blade isn't cutting the joist at too much of bevel (square cut as possible) and use the joist hangers. Use the level to draw the cut lines plumb. H.