This chart is for initial rough sizing hip and valley rafters, work should be checked by an engineer before plans are finalized. Length L in feet is shown at right. This chart is for intersections of equal pitch ONLY. Column headings refer to live load. This is based on an article in The Journal Of Light ConstructionNotes: Lumber Fb 1,000PSI, E 1,000,000PSI LVL Fb 2,800PSI, E 2,000,000PSI 10PSF dead load No slope adjustments allowed |
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| L | 15PSF | 30PSF | 45PSF | 60PSF |
| 4 | 2x6 | 2x6 | 2x6 | 2x8 |
| 5 | 2x6 | 2x6 | 2x6 | 2x8 |
| 6 | 2x6 | 2x8 | 2x8 | 2x10 |
| 7 | 2x8 | 2x10 | 2x10 | 2x12 |
| 8 | 2x10 | 2x12 | 2x12 | (2)2x12 |
| 9 | 2x10 | (2)2x12 | (2)2x12 | (2)2x12 |
| 10 | 2x12 | (2)2x12 | (2)2x12 | LVL11-7/8 |
| 11 | (2)2x12 | (2)2x12 | LVL11-7/8 | LVL11-7/8 |
| 12 | (2)2x12 | LVL11-7/8 | LVL11-7/8 | LVL14 |
| 13 | (2)2x12 | LVL11-7/8 | LVL14 | (2)LVL14 |
| 14 | LVL11-7/8 | LVL14 | (2)LVL14 | (2)LVL14 |
| 15 | LVL11-7/8 | LVL14 | (2)LVL14 | (2)LVL14 |
| 16 | LVL11-7/8 | (2)LVL14 | (2)LVL14 | (2)LVL16 |
| 17 | LVL14 | (2)LVL14 | (2)LVL16 | (2)LVL16 |
| 18 | LVL14 | (2)LVL14 | (2)LVL16 | -- |
| 19 | (2)LVL14 | (2)LVL16 | -- | -- |
| 20 | (2)LVL14 | (2)LVL16 | -- | -- |