Span Tables

Joists & Rafters

Please click on the Table Number below to download the maximum span table of your choice. Also see Using These Tables and our examples of how to read the table values and more.

Click on Southern Pine Maximum Spans for Joists & Rafters to download the complete publication with explanatory text and all 46 tables.

• Table Number	Live Load(psf)	Dead Load(psf)	Deflection Limit
  Floor Joists
  1 2 3 4 5 6 7 8 9 10 11	30 40 50 60 40 50 60 75 80 90 100	10 10 10 10 20 20 20 10 10 10 10	360 360 360 360 360 360 360 360 360 360 360
  Wet-Service Floor Joists (MC > 19%)
  12 13 14	40 60 100	10 10 10	360 360 360
  Ceiling Joists
  15 16	10 20	5 10	240 240
  Rafters (Snow Load, CD = 1.15)
  17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40	20 30 40 50 20 30 40 50 20 30 40 50 20 30 40 50 20 30 40 50 20 30 40 50	10 10 10 10 15 15 15 15 20 20 20 20 10 10 10 10 15 15 15 15 20 20 20 20	240 240 240 240 240 240 240 240 240 240 240 240 180 180 180 180 180 180 180 180 180 180 180 180
  Rafters (Construction Load, CD = 1.25)
  41 42 43 44 45 46	20 20 20 20 20 20	10 15 20 10 15 20	240 240 240 180 180 180
  MC = Moisture Content		CD = Load Duration Factor