A 10/12 roof pitch — known as “10 over 12” — is a steep roof angle that delivers excellent weather protection and dramatic curb appeal. When you hear “10 over 12,” it means the roof rises 10 inches for every 12 inches of horizontal run. This works out to an angle of approximately 39.81 degrees, giving homes a bold and striking appearance.
What Does a 10-12 Roof Pitch Represent?
With a 10/12 pitch, the roof increases 10 inches in height for every foot of horizontal span. This results in an angle of about 39.81 degrees and a slope of 83.33%. It’s a steep pitch built for fast water and snow runoff, especially in climates with harsh weather.
- Pitch: 10/12 (or “10 over 12”)
- Angle in Degrees: 39.81°
- Slope Percentage: 83.33%
- Rafter Length (per 12 inches of run): Approximately 15.62 inches
Want to check your roof pitch? Use our calculator app to find roof pitch, angle and slope.
Is a 10-12 Roof Pitch a Good Choice?
Yes — a 10/12 pitch is a great choice if you’re looking for high-performance drainage and a visually impressive roofline. Here’s why many homeowners and builders appreciate this pitch:
- Excellent water and snow runoff for tough weather
- Works well with durable materials like metal and slate
- Sharp roofline for standout curb appeal
- More attic space and ventilation opportunities
Installation & Cost Insights
A 10/12 pitch is considered steep, which means roofers need extra safety measures and equipment. Labor costs are typically higher than for lower slopes, but the benefits of weather protection and visual impact make it a worthwhile choice.
How Does a 10/12 Pitch Compare in Degrees to Other Roof Slopes?
At around 39.81 degrees, a 10/12 pitch is steeper than most common residential pitches like 6/12 or 8/12. It’s approaching the steepest standard roof pitches, offering strong performance and distinctive looks.
What is the Angle in Degrees for a 10-12 Roof Pitch?
The angle for a 10/12 roof pitch is approximately 39.81 degrees. For a complete list of roof pitches and angles, check out our roof pitch, angle & slope chart.
Knowing your roof’s pitch angle helps you make smart choices for materials and installation. The 10/12 pitch combines excellent performance with bold design.
Where Do You See 10/12 Roof Pitches?
The 10/12 pitch is popular in custom homes and areas with heavy snowfall. You’ll often see this pitch in:
- Luxury custom homes — Bold design paired with steep hip roofs for visual impact
- Mountain retreats — Handles snow accumulation with ease
- Detached garages and sheds — Matches steeper main roof designs
- Porches and additions — Complements dramatic home styles
- Snowy and rainy climates — Keeps water and snow moving quickly
Builders appreciate the 10/12 pitch for its reliability in harsh climates and its architectural character. It’s a strong choice for homeowners who want durability and standout style.
Overall, the 10/12 roof pitch delivers outstanding weather protection and a distinctive look, making it a smart option for many residential builds.