20/12 roof pitch
59.04° angle
A 20/12 roof rises 20 in for every 12 in of run: a 166.7% slope with a 1.944 area multiplier.
| Pitch | 20 in 12 (20:12) |
|---|---|
| Angle | 59.04° |
| Slope | 166.7% |
| Roof area multiplier | 1.9437 |
| Rafter length per foot of run | 23.32 in |
| Type | A very steep roof |
Roofing for a 20/12 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 20/12
| Run (half the span) | Rise | Rafter length (before overhang) |
|---|---|---|
| 10 ft | 16.67 ft | 19.44 ft |
| 12 ft | 20 ft | 23.32 ft |
| 14 ft | 23.33 ft | 27.21 ft |
| 16 ft | 26.67 ft | 31.1 ft |
Change the numbers
Other roof pitches
Questions
- What angle is a 20/12 roof pitch?
- 59.04 degrees.
- What is a 20/12 roof pitch as a percentage?
- 166.7%: the roof rises 20 inches for every 12 inches of run.
- What is the roof multiplier for a 20/12 pitch?
- 1.944. Multiply the roof’s flat footprint by 1.944 to get its actual surface area.
- Is a 20/12 roof walkable?
- Not walkable: roofers work from roof jacks and fall protection, which adds labor cost.