13/12 roof pitch
47.29° angle
A 13/12 roof rises 13 in for every 12 in of run: a 108.3% slope with a 1.474 area multiplier.
| Pitch | 13 in 12 (13:12) |
|---|---|
| Angle | 47.29° |
| Slope | 108.3% |
| Roof area multiplier | 1.4743 |
| Rafter length per foot of run | 17.69 in |
| Type | A very steep roof |
Roofing for a 13/12 pitch
Suitable for asphalt shingles, metal, tile and most other roofing with standard underlayment. Not walkable: roofers work from roof jacks and fall protection, which adds labor cost.
Rafter length at 13/12
| Run (half the span) | Rise | Rafter length (before overhang) |
|---|---|---|
| 10 ft | 10.83 ft | 14.74 ft |
| 12 ft | 13 ft | 17.69 ft |
| 14 ft | 15.17 ft | 20.64 ft |
| 16 ft | 17.33 ft | 23.59 ft |
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Other roof pitches
Questions
- What angle is a 13/12 roof pitch?
- 47.29 degrees.
- What is a 13/12 roof pitch as a percentage?
- 108.3%: the roof rises 13 inches for every 12 inches of run.
- What is the roof multiplier for a 13/12 pitch?
- 1.474. Multiply the roof’s flat footprint by 1.474 to get its actual surface area.
- Is a 13/12 roof walkable?
- Not walkable: roofers work from roof jacks and fall protection, which adds labor cost.