An 11/12 roof pitch — also called “11 over 12” — is an extremely steep roof slope, chosen for its powerful drainage and bold architectural profile. “11 over 12” means the roof rises 11 inches for every 12 inches of horizontal run. This creates an angle of about 42.51 degrees, making it one of the steepest common residential pitches.
What Does an 11-12 Roof Pitch Represent?
With an 11/12 pitch, the roof increases 11 inches in height for every foot of horizontal distance. This equals an angle of approximately 42.51 degrees and a slope of 91.67%. It’s built for fast water and snow runoff, especially in regions that experience heavy precipitation.
- Pitch: 11/12 (or “11 over 12”)
- Angle in Degrees: 42.51°
- Slope Percentage: 91.67%
- Rafter Length (per 12 inches of run): Approximately 16.28 inches
Need to verify your roof pitch? Use our roof pitch calculator app for detailed results.
Is an 11-12 Roof Pitch a Good Choice?
Yes — an 11/12 pitch is an excellent choice for homes in areas with extreme weather conditions. It provides rapid runoff, minimizes snow buildup, and creates a commanding roofline. Here’s why it’s a solid option:
- Superior runoff for rain and snow
- Works well with metal roofing and durable shingles
- Creates a dramatic roofline for visual appeal
- Allows for expanded attic space and ventilation
Installation & Cost Insights
Installing an 11/12 roof pitch requires specialized safety equipment and experienced crews due to the steep angle. While labor costs are higher, the performance in harsh weather and the striking visual profile justify the investment.
How Does an 11/12 Pitch Compare in Degrees to Other Roof Slopes?
At roughly 42.51 degrees, an 11/12 pitch is steeper than almost all typical residential roof pitches. It’s just below the extreme 12/12 pitch and offers exceptional drainage with a bold architectural style.
What is the Angle in Degrees for an 11-12 Roof Pitch?
The angle of an 11/12 roof pitch is approximately 42.51 degrees. For more angles and slope comparisons, visit our roof pitch, angles and slope chart.
Understanding your roof’s pitch angle helps you choose materials and plan your installation effectively. The 11/12 pitch excels in tough environments and delivers standout curb appeal.
Where Do You See 11/12 Roof Pitches?
The 11/12 pitch is chosen for homes in regions with heavy snowfall and rain, as well as custom homes seeking bold design. You’ll often see this pitch in:
- Chalets and alpine homes — Built for snowy conditions, often with steep hip roofs
- Custom luxury builds — For dramatic visual impact and strong performance
- Detached garages and sheds — Matches main home steep slopes
- Covered porches and additions — Complements high-pitch roof designs
- Regions with severe weather — Maximizes runoff and durability
Builders select the 11/12 pitch for its excellent drainage and striking appearance. It’s a strong choice for anyone looking for durability and visual distinction.
Overall, the 11/12 roof pitch combines robust performance with eye-catching design, making it ideal for homes in demanding environments.