4/12 roof pitch
18.43° angle
A 4/12 roof rises 4 in for every 12 in of run: a 33.3% slope with a 1.054 area multiplier.
| Pitch | 4 in 12 (4:12) |
|---|---|
| Angle | 18.43° |
| Slope | 33.3% |
| Roof area multiplier | 1.0541 |
| Rafter length per foot of run | 12.65 in |
| Type | A conventional pitch |
Roofing for a 4/12 pitch
Suitable for asphalt shingles, metal, tile and most other roofing with standard underlayment. Walkable for most people with care and soft-soled shoes.
Rafter length at 4/12
| Run (half the span) | Rise | Rafter length (before overhang) |
|---|---|---|
| 10 ft | 3.33 ft | 10.54 ft |
| 12 ft | 4 ft | 12.65 ft |
| 14 ft | 4.67 ft | 14.76 ft |
| 16 ft | 5.33 ft | 16.87 ft |
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Other roof pitches
Questions
- What angle is a 4/12 roof pitch?
- 18.43 degrees.
- What is a 4/12 roof pitch as a percentage?
- 33.3%: the roof rises 4 inches for every 12 inches of run.
- What is the roof multiplier for a 4/12 pitch?
- 1.054. Multiply the roof’s flat footprint by 1.054 to get its actual surface area.
- Is a 4/12 roof walkable?
- Walkable for most people with care and soft-soled shoes.