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Please click on the Table Number below to download the maximum span
table of your choice. Also click on Using
These Tables.
Click on Southern
Pine Maximum Spans for Joists & Rafters to download the complete
publication with explanatory text and all 48 tables.
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| Floor Joists |
| 1 |
30 |
10 |
360 |
| 2 |
40 |
10 |
360 |
| 3 |
50 |
10 |
360 |
| 4 |
60 |
10 |
360 |
| 5 |
40 |
20 |
360 |
| 6 |
50 |
20 |
360 |
| 7 |
60 |
20 |
360 |
| 8 |
75 |
10 |
360 |
| 9 |
80 |
10 |
360 |
| 10 |
90 |
10 |
360 |
| 11 |
100 |
10 |
360 |
| 12 |
125 |
10 |
360 |
| 13 |
150 |
10 |
360 |
| Wet-Service Floor Joists (MC
> 19%) |
| 14 |
40 |
10 |
360 |
| 15 |
60 |
10 |
360 |
| 16 |
100 |
10 |
360 |
| Ceiling Joists |
| 17 |
10 |
5 |
240 |
| 18 |
20 |
10 |
240 |
| Rafters (Snow
Load, CD = 1.15) |
| 19 |
20 |
10 |
240 |
| 20 |
30 |
10 |
240 |
| 21 |
40 |
10 |
240 |
| 22 |
50 |
10 |
240 |
| 23 |
20 |
15 |
240 |
| 24 |
30 |
15 |
240 |
| 25 |
40 |
15 |
240 |
| 26 |
50 |
15 |
240 |
| 27 |
20 |
20 |
240 |
| 28 |
30 |
20 |
240 |
| 29 |
40 |
20 |
240 |
| 30 |
50 |
20 |
240 |
| 31 |
20 |
10 |
180 |
| 32 |
30 |
10 |
180 |
| 33 |
40 |
10 |
180 |
| 34 |
50 |
10 |
180 |
| 35 |
20 |
15 |
180 |
| 36 |
30 |
15 |
180 |
| 37 |
40 |
15 |
180 |
| 38 |
50 |
15 |
180 |
| 39 |
20 |
20 |
180 |
| 40 |
30 |
20 |
180 |
| 41 |
40 |
20 |
180 |
| 42 |
50 |
20 |
180 |
| Rafters (Construction
Load, CD = 1.25) |
| 43 |
20 |
10 |
240 |
| 44 |
20 |
15 |
240 |
| 45 |
20 |
20 |
240 |
| 46 |
20 |
10 |
180 |
| 47 |
20 |
15 |
180 |
| 48 |
20 |
20 |
180 |
| MC = Moisture Content |
CD = Load Duration Factor |
Click for an online joist & rafter span calculator provided by AF&PA's American Wood Council.
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