1. What is Rafter Length?

Rafter length is the diagonal distance from the outside of the wall plate to the center of the ridge board in roof construction. It's a crucial measurement for proper roof framing and material estimation.

2. How Does the Calculator Work?

The calculator uses the Pythagorean theorem:

Where:

• \( \text{Run} \) — Horizontal distance (feet)
• \( \text{Rise} \) — Vertical distance (feet)

Explanation: The formula calculates the hypotenuse of a right triangle formed by the run and rise measurements.

3. Importance of Rafter Length Calculation

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

4. Using the Calculator

Tips: Enter run and rise measurements in feet. Both values must be positive numbers. The calculator will compute the diagonal rafter length.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between run and rise?
A: Run is the horizontal distance, while rise is the vertical distance from the wall plate to the ridge.

Q2: How do I measure run and rise?
A: Run is half the building width minus half the ridge thickness. Rise is determined by roof pitch.

Q3: Does this account for overhangs?
A: No, this calculates the basic rafter length. Add overhang length separately if needed.

Q4: Can I use this for different units?
A: The calculator uses feet. Convert other units to feet before calculation.

Q5: How precise should my measurements be?
A: For construction, measure to at least 1/8 inch (0.01 feet) precision.