1. What is a Hip Roof?

A hip roof is a type of roof where all sides slope downwards to the walls, usually with a fairly gentle slope. It is a common roof style that provides excellent stability and resistance to wind.

2. How Does the Calculator Work?

The calculator uses the common rafter formula:

Where:

• \( Run \) — Horizontal distance from wall to ridge (meters)
• \( Pitch \) — Roof pitch angle (degrees)
• \( \cos \) — Trigonometric cosine function

Explanation: This formula calculates the length of the common rafter based on the roof's horizontal run and pitch angle.

3. Importance of Accurate Roof Calculations

Details: Precise roof calculations are essential for proper construction, material estimation, structural integrity, and ensuring the roof meets building code requirements.

4. Using the Calculator

Tips: Enter the run in meters and pitch in degrees. Ensure values are valid (run > 0, pitch between 1-89 degrees).

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between run and rise?
A: Run is the horizontal distance, while rise is the vertical height. Pitch is the angle between them.

Q2: How accurate should my measurements be?
A: For construction purposes, measurements should be precise to within 1-2 cm for optimal results.

Q3: Can this calculator be used for other roof types?
A: While designed for hip roofs, the common rafter calculation applies to many simple roof types.

Q4: What factors affect rafter length?
A: Main factors are roof span, pitch angle, overhang requirements, and roof design complexity.

Q5: Should I add extra length for overhangs?
A: Yes, additional length should be calculated separately for eaves overhangs beyond the basic rafter length.