1. What is Load Angle Factor (LAF)?

The Load Angle Factor (LAF) is a multiplier used in roof design and structural engineering to account for the increased load on roof members due to the angle of inclination. It represents the ratio of the actual load along the roof member to the vertical load component.

2. How Does the Calculator Work?

The calculator uses the LAF formula:

Where:

• \( \theta \) — Roof angle in degrees
• \( \cos(\theta) \) — Cosine of the roof angle

Explanation: As the roof angle increases, the load along the roof member increases relative to the vertical load, requiring a higher factor to ensure structural safety.

3. Importance of LAF Calculation

Details: Accurate LAF calculation is crucial for proper roof design, ensuring structural integrity, and meeting building code requirements for snow, wind, and dead loads on sloped surfaces.

4. Using the Calculator

Tips: Enter the roof angle in degrees (0-89.99°). The calculator will compute the corresponding Load Angle Factor. Angles approaching 90° result in very high factors.

5. Frequently Asked Questions (FAQ)

Q1: What is the range of valid angles for LAF calculation?
A: Angles from 0° to just under 90° are valid. At 90°, the factor becomes infinite and is not physically meaningful for roof design.

Q2: How does LAF affect roof design?
A: Higher LAF values indicate greater load magnification along roof members, requiring stronger structural elements and connections.

Q3: When is LAF most critical in roof design?
A: LAF is particularly important for steep roofs and in regions with heavy snow loads or high wind conditions.

Q4: Are there building code requirements for LAF?
A: Most building codes reference LAF calculations for roof design, particularly in sections dealing with snow and wind loading on sloped surfaces.

Q5: Can LAF be less than 1?
A: No, LAF is always ≥1. At 0° (flat roof), LAF = 1. As the angle increases, LAF increases accordingly.