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Supply Chain
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Rafter Formulas |
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| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 | Column 7 | Column 8 | Column 9 |
inch rise |
inch length |
factor x run = rafter length |
angle from horizontal |
length hip or valley rafter per ft of run |
difference in jack at 16" oc |
difference in jack at 24" oc |
side cut of jack |
side cut of hip or valley |
| 1 in 12 | 12.0416 | 1.00347 | 4º 46' | - | - | - | - | - |
| 2 in 12 | 12.1655 | 1.01379 | 9º 28' | 17.09 | 16-1/4 | 24-5/16 | 11-13/16 | 11-15/16 |
| 3 in 12 | 12.3693 | 1.03078 | 14º 2' | 17.23 | 16-1/2 | 24-3/8 | 11-5/8 | 11-13/16 |
| 4 in 12 | 12.6491 | 1.05409 | 18º 26' | 17.44 | 16-7/8 | 25-5/16 | 11-3/8 | 11-11/16 |
| 5 in 12 | 13.0 | 1.08333 | 22º 37' | 17.69 | 17-5/16 | 26 | 11-1/16 | 11-1/2 |
| 6 in 12 | 13.4164 | 1.11803 | 26º 34' | 18.0 | 17-7/8 | 26-13/16 | 10-3/4 | 11-5/16 |
| 7 in 12 | 13.8924 | 1.15770 | 30º 15' | 18.36 | 18-1/2 | 27-3/4 | 10-3/8 | 11-1/16 |
| 8 in 12 | 14.4222 | 1.20185 | 33º 41' | 18.76 | 19-1/4 | 28-7/8 | 10 | 10-7/8 |
| 9 in 12 | 15.0 | 1.250 | 36º 53' | 19.21 | 20 | 30 | 9-5/8 | 10-5/8 |
| 10 in 12 | 15.6205 | 1.30171 | 39º 46' | 19.70 | 20-13/16 | 31-1/4 | 9-1/4 | 10-5/8 |
| 11 in 12 | 16.2788 | 1.35657 | 42º 31' | 20.22 | 21-11/16 | 32-9/16 | 8-7/8 | 10-1/8 |
| 12 in 12 | 16.9706 | 1.41421 | 45º 0' | 20.78 | 22-5/8 | 33-15/16 | 8-1/2 | 9-7/8 |
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| 13 in 12 | 17.6918 | 1.47432 | 47º 17' | 21.38 | 23-9/16 | 35-3/8 | 8-1/8 | 9-5/8 |
| 14 in 12 | 18.4391 | 1.53659 | 49º 24' | 22.0 | 24-9/16 | 36-7/8 | 7-13/16 | 9-3/8 |
| 15 in 12 | 19.2094 | 1.60078 | 51º 21' | 22.65 | 25-5/8 | 38-7/16 | 7-1/2 | 9-1/16 |
| 16 in 12 | 20.0 | 1.66667 | 53º 8' | 23.32 | 26-11/16 | 40 | 7-3/16 | 8-3/4 |
| 17 in 12 | 20.8087 | 1.73405 | 54º 47' | 24.02 | 27-3/4 | 41-5/8 | 6-15/16 | 8-1/2 |
| 18 in 12 | 21.6333 | 1.80278 | 56º 18' | 24.74 | 28-7/8 | 43-1/4 | 6-11/16 | 8-1/4 |
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