Maximum Horizontal Roof Rafter Span
Douglas Fir and maximum span
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Douglas fir maximum horizontal roof rafter span for Lumber Grade Selected Structural and No. 1 and No. 2, are indicated below. Max. dead load (weight of structure and fixed loads) 15 lbs/ft2. Live load is weight of furniture, wind, snow ..
- 1 psf (lbf/ft2) = 47.88 N/m2
Max. Live Load 20 lbs/ft2
| Maximum Span (ft - in) | ||||
| Nominal Size (inches) |
Rafter Spacing, Center to Center (inches) |
Lumber Grade | ||
| Selected Structural | No. 1 | No. 2 | ||
| 2 x 6 | 12 | 16' - 4'' | 15' - 9'' | 14' - 9'' |
| 16 | 14' - 11'' | 13' - 8'' | 12' - 9'' | |
| 24 | 13' | 11' - 2'' | 10' - 5'' | |
| 2 x 8 | 12 | 21' - 7'' | 19' - 11'' | 18' - 8'' |
| 16 | 19' - 7'' | 17' - 3'' | 16' - 2'' | |
| 24 | 17' | 14' - 1'' | 13' - 2'' | |
| 2 x 10 | 12 | 27' - 6'' | 24' - 4'' | 22' - 9'' |
| 16 | 25' | 21' - 1'' | 19' - 9'' | |
| 24 | 20' - 9'' | 17' - 3'' | 16' - 1'' | |
| 2 x 12 | 12 | 33' - 6'' | 28' - 3'' | 26' - 5'' |
| 16 | 29' - 5'' | 24' - 5'' | 22' - 10'' | |
| 24 | 24' | 20' | 18' - 8'' | |
Max. Live Load 60 lbs/ft2
| Maximum Span (ft - in) | ||||
| Nominal Size (inches) |
Joist Spacing Center to Center (inches) |
Lumber Grade | ||
| Selected Structural | No. 1 | No. 2 | ||
| 2 x 8 | 12 | 15' - 0'' | 13' - 7'' | 12' - 3'' |
| 16 | 13' - 7'' | 11' - 9'' | 11' | |
| 24 | 11' - 7'' | 9' - 8'' | 9' | |
| 2 x 10 | 12 | 19' - 1'' | 16' - 8'' | 15' - 7'' |
| 16 | 17' - 4'' | 14' - 05'' | 13' - 6'' | |
| 24 | 14' - 2'' | 11' - 9'' | 11' | |
| 2 x 12 | 12 | 23' - 3'' | 19' - 3'' | 18' |
| 16 | 20' - 1'' | 16' - 8'' | 15' - 7'' | |
| 24 | 16' - 5'' | 13' - 8'' | 12' - 9'' | |
| 2 x 14 | 12 | 25' - 11'' | 21' - 7'' | 20' - 2'' |
| 16 | 22' - 6'' | 18' - 8'' | 17' - 5'' | |
| 24 | 18' - 4'' | 15' - 3'' | 14' - 3'' | |
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