1. What is Shed Rafter Length?

The shed rafter length is the measurement from the top of the wall plate to the center of the ridge board along the rafter. It's essential for proper roof construction and material estimation.

2. How Does the Calculator Work?

The calculator uses the trigonometric formula:

Where:

• \( Run \) — Horizontal distance from outside of wall to center of ridge (feet)
• \( Pitch \) — Angle of roof slope (degrees)
• \( \cos \) — Trigonometric cosine function

Explanation: The formula accounts for the increased length of the rafter due to the roof's slope angle.

3. Importance of Rafter Length Calculation

Details: Accurate rafter length calculation ensures proper roof framing, prevents material waste, and helps maintain structural integrity of the shed.

4. Using the Calculator

Tips: Enter run in feet and pitch in degrees. The pitch must be between 0 and 90 degrees (0° = flat roof, 90° = vertical wall).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between run and span?
A: Run is half the span for a symmetrical gable roof. Span is the total width between exterior walls.

Q2: How do I measure the run?
A: Measure horizontally from the outside of the wall to the centerline of the ridge board.

Q3: What's a typical shed roof pitch?
A: Common pitches range from 3:12 (14°) to 6:12 (26.5°), but depends on roofing material and snow load requirements.

Q4: Does this work for other roof types?
A: This formula works for common gable roofs. Hip roofs and other complex designs require additional calculations.

Q5: Should I add overhang to this calculation?
A: This calculates the basic rafter length. Add overhang separately if needed.