1. What is Lean To Rafter Length?

The Lean To Rafter Length is the diagonal measurement from the top plate of the wall to the ridge board or supporting structure. It's calculated using the Pythagorean theorem based on the width and height of the lean-to structure.

2. How Does the Calculator Work?

The calculator uses the Pythagorean theorem:

Where:

• \( \text{Width} \) — Horizontal distance (in feet)
• \( \text{Height} \) — Vertical rise (in feet)

Explanation: This formula calculates the hypotenuse of a right triangle formed by the width and height of the lean-to structure.

3. Importance of Accurate Rafter Length

Details: Precise rafter length calculation ensures proper roof construction, prevents material waste, and maintains structural integrity of the lean-to.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Should I add extra length for overhang?
A: Yes, this calculation gives the basic rafter length. Add additional length for any desired overhang beyond the wall.

Q2: How precise does this need to be?
A: Rafter length should be accurate to within 1/8 inch for proper fit in construction.

Q3: Does this work for any roof pitch?
A: This specific formula is for single-slope lean-to roofs. Other roof types require different calculations.

Q4: How do I account for ridge board thickness?
A: Subtract half the ridge board thickness from your width measurement before calculating.

Q5: Can I use this for metric measurements?
A: The formula works the same, but you'll need to convert all measurements to the same unit (feet or meters).