| Height Above PLate Table -- 8 / 12 | Rafter Seat Cut Length -- Each rows shows seat cut length with H.A.P for material size | ||||||||||
| Material | Plumb height | 1 1/2 | 2 | 2 1/2 | 3 | 3 1/8 | 3 1/2 | 4 | 5 1/8 | 5 1/2 | 6 3/4 |
| 2x4 | 4.21 | 3.21 | 2.87 | 2.54 | 2.21 | 2.12 | 1.87 | 1.54 | 0.79 | 0.54 | -0.29 |
| 2x6 | 6.61 | 5.61 | 5.28 | 4.94 | 4.61 | 4.53 | 4.28 | 3.94 | 3.19 | 2.94 | 2.11 |
| 2x8 | 9.01 | 8.01 | 7.68 | 7.35 | 7.01 | 6.93 | 6.68 | 6.35 | 5.60 | 5.35 | 4.51 |
| 2x10 | 11.42 | 10.42 | 10.08 | 9.75 | 9.42 | 9.33 | 9.08 | 8.75 | 8.00 | 7.75 | 6.92 |
| 2x12 | 13.82 | 12.82 | 12.49 | 12.15 | 11.82 | 11.74 | 11.49 | 11.15 | 10.40 | 10.15 | 9.32 |
| 1 3/4 X 11 7/8 | 14.27 | 13.27 | 12.94 | 12.61 | 12.27 | 12.19 | 11.94 | 11.61 | 10.86 | 10.61 | 9.77 |