12/12 roof pitch
45° angle
A 12/12 roof rises 12 in for every 12 in of run: a 100% slope with a 1.414 area multiplier.
| Pitch | 12 in 12 (12:12) |
|---|---|
| Angle | 45° |
| Slope | 100% |
| Roof area multiplier | 1.4142 |
| Rafter length per foot of run | 16.97 in |
| Type | A steep roof |
Roofing for a 12/12 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 12/12
| Run (half the span) | Rise | Rafter length (before overhang) |
|---|---|---|
| 10 ft | 10 ft | 14.14 ft |
| 12 ft | 12 ft | 16.97 ft |
| 14 ft | 14 ft | 19.8 ft |
| 16 ft | 16 ft | 22.63 ft |
Change the numbers
Other roof pitches
Questions
- What angle is a 12/12 roof pitch?
- 45 degrees.
- What is a 12/12 roof pitch as a percentage?
- 100%: the roof rises 12 inches for every 12 inches of run.
- What is the roof multiplier for a 12/12 pitch?
- 1.414. Multiply the roof’s flat footprint by 1.414 to get its actual surface area.
- Is a 12/12 roof walkable?
- Not walkable: roofers work from roof jacks and fall protection, which adds labor cost.