What a 7/12 pitch means
A 7/12 roof rises 7 inches for every 12 inches it runs horizontally, which is an angle of 30.26° from level and a 58.3% slope. It is a conventional roof, walkable with care.
Roofing for a 7/12 roof
Suits almost every roofing: asphalt shingles, metal, wood shakes, clay or concrete tile.
Rise and rafter length at 7/12
For a gable roof, the run is half the building width. Rafter lengths are before the ridge deduction and overhang.
| Run | Building width | Rise | Rafter length |
|---|---|---|---|
| 4 ft | 8 ft | 2' 4" | 4' 7 9/16" |
| 6 ft | 12 ft | 3' 6" | 6' 11 3/8" |
| 8 ft | 16 ft | 4' 8" | 9' 3 1/8" |
| 10 ft | 20 ft | 5' 10" | 11' 6 15/16" |
| 12 ft | 24 ft | 7' | 13' 10 11/16" |
| 14 ft | 28 ft | 8' 2" | 16' 2 1/2" |
| 16 ft | 32 ft | 9' 4" | 18' 6 1/4" |
| 20 ft | 40 ft | 11' 8" | 23' 1 7/8" |
Roof area at 7/12
Multiply the building footprint (including the overhangs) by 1.158 to get the roof surface. A 30 × 40 ft footprint has 1389 sq ft of roof at 7/12 — about 44 sheets of 4 × 8 sheathing before waste.