What is roof pitch?

Roof pitch expresses how steeply a roof slopes, stated as a ratio of vertical rise to horizontal run. A 6:12 pitch, for example, means the roof climbs 6 inches for every 12 inches it extends horizontally. A 12:12 pitch (also called a 45-degree roof) rises 12 inches per 12 inches of run. Flatter roofs have lower ratios like 2:12, while steeper residential roofs often fall between 6:12 and 10:12.

Pitch matters because it directly shapes which roofing materials will perform well and how much labor a job demands. Steeper pitches shed water and snow faster, which suits asphalt shingles and metal roofing. Flatter pitches require materials and installation methods that handle standing water, such as tar and gravel or single-ply membrane systems. Contractors on steep pitches face safety challenges, higher risk, and longer timelines. They also need more equipment, more fall protection, and steeper learning curves for installation accuracy. A roofer working a 4:12 pitch on a ranch home near Atlanta will move differently and faster than one tackling a 10:12 steep gable on a mountain cabin.

Understanding your roof's pitch helps you pick the right contractor and materials for your climate and home design. When evaluating roofing providers in Georgia, ask them about their experience with your specific pitch.