PITCH SPECIFICATION & GEOMETRY

5/12 Roof Pitch: Angle, Multiplier & Installation Standards

A 5/12 roof pitch rises 5 inches vertically for every 12 inches of horizontal run. It represents an angle of $22.62^circ$, a slope grade of $41.67%$, and a pitch multiplier of 1.083. It is one of the most widely built residential roof slopes across North American ranch and suburban subdivisions.

5/12 Quick Specifications

Vertical Rise: 5 inches per 12 inches of run ($5:12$ ratio)
Roof Angle: $22.62^circ$
Slope Percentage: $41.67%$ grade
Pitch Multiplier: 1.083
Walkability: Easily walkable with standard work footwear.

Why 5/12 is a Popular Residential Choice

The 5/12 pitch offers distinct advantages for homeowners and builders alike:

  • Standard Underlayment Permitted: Unlike slopes below 4/12, a 5/12 pitch allows standard single-layer synthetic or felt underlayment application without double-layering.
  • Excellent Drainage: Efficiently sheds rainwater and light snowfall while maintaining a lower roof profile that resists high wind uplifting.
  • Cost-Effective Construction: Easily framed with pre-engineered roof trusses and fast, walkable installation that keeps roofing labor rates at standard baselines.

Area Calculation Example for a 5/12 Roof

To calculate true sloped roof surface area for a 5/12 pitch, multiply the horizontal footprint by 1.083:

$$text{Surface Area} = 2,000text{ sq ft} times 1.083 = mathbf{2,166text{ sq ft}} quad (21.7text{ Squares})$$

Related Tools & Guides

Calculate rafter lengths with our Rafter Calculator, compare pitches on our Roof Pitch Chart, or check our 6/12 Roof Pitch Guide.