3/12 roof pitch
14.04° angle
A 3/12 roof rises 3 in for every 12 in of run: a 25% slope with a 1.031 area multiplier.
| Pitch | 3 in 12 (3:12) |
|---|---|
| Angle | 14.04° |
| Slope | 25% |
| Roof area multiplier | 1.0308 |
| Rafter length per foot of run | 12.37 in |
| Type | A low-slope roof |
Roofing for a 3/12 pitch
Shingles are allowed from 2/12 to 4/12 only with a double layer of underlayment or ice-and-water shield. Metal roofing and membranes are common choices. Walkable for most people with care and soft-soled shoes.
Rafter length at 3/12
| Run (half the span) | Rise | Rafter length (before overhang) |
|---|---|---|
| 10 ft | 2.5 ft | 10.31 ft |
| 12 ft | 3 ft | 12.37 ft |
| 14 ft | 3.5 ft | 14.43 ft |
| 16 ft | 4 ft | 16.49 ft |
Change the numbers
Other roof pitches
Questions
- What angle is a 3/12 roof pitch?
- 14.04 degrees.
- What is a 3/12 roof pitch as a percentage?
- 25%: the roof rises 3 inches for every 12 inches of run.
- What is the roof multiplier for a 3/12 pitch?
- 1.031. Multiply the roof’s flat footprint by 1.031 to get its actual surface area.
- Is a 3/12 roof walkable?
- Walkable for most people with care and soft-soled shoes.