A 12/12 roof pitch — also known as “12 over 12” — is one of the steepest standard residential roof pitches. “12 over 12” means the roof rises 12 inches for every 12 inches of horizontal run, creating a perfect 45-degree angle. This pitch delivers excellent water and snow shedding, along with a bold, eye-catching design.
What Does a 12-12 Roof Pitch Represent?
With a 12/12 pitch, your roof gains 12 inches in height for every foot of horizontal distance. This translates to an angle of exactly 45 degrees and a slope of 100%. It’s a true steep slope, built for maximum water and snow runoff.
- Pitch: 12/12 (or “12 over 12”)
- Angle in Degrees: 45°
- Slope Percentage: 100%
- Rafter Length (per 12 inches of run): Approximately 16.97 inches
Want to check your roof pitch? Use our calculator app to calculate pitch and slope easily.
Is a 12-12 Roof Pitch a Good Choice?
Yes — if you’re looking for superior drainage and dramatic style, the 12/12 pitch is an excellent option. While it’s among the steepest residential roof pitches, it offers strong protection and impressive visual impact. Here’s why it works well:
- Rapid runoff for rain and heavy snow
- Ideal for materials like metal roofing and wood shakes
- Bold roofline for standout architecture
- Extra attic space and ventilation potential
Installation & Cost Insights
With its steep angle, a 12/12 roof requires specialized safety equipment and experienced installers. Labor costs will be higher than for gentler slopes, but the payoff is a highly durable roof with outstanding drainage and curb appeal.
How Does a 12/12 Pitch Compare in Degrees to Other Roof Slopes?
At exactly 45 degrees, a 12/12 pitch stands at the upper limit of common residential roof slopes. It’s steeper than pitches like 8/12 or 10/12, delivering maximum performance in tough weather conditions.
What is the Angle in Degrees for a 12-12 Roof Pitch?
The angle of a 12/12 roof pitch is exactly 45 degrees. For other common roof angles, take a look at our detailed roof pitch chart.
Understanding your roof’s pitch angle helps with material selection, cost planning, and proper installation. The 12/12 pitch combines striking design with excellent performance.
Where Do You See 12/12 Roof Pitches?
The 12/12 pitch is popular in homes that need fast drainage and want a bold architectural statement. You’ll often see this pitch in:
- A-frame houses — Iconic steep slope design for maximum performance
- Chalets and alpine homes — Built to handle heavy snow, often with sharp gable roofs
- Detached garages and sheds — Matches steep home rooflines for consistency
- Porches and additions — Complements dramatic main roof pitches
- Regions with heavy snow or rain — Keeps water and snow moving off the roof fast
Builders appreciate the 12/12 pitch for its reliable performance and bold look. It’s a solid choice for homeowners who value durability and distinctive architecture.
Overall, the 12/12 roof pitch offers maximum weather protection and visual impact, making it an excellent option for both design and durability.