1. What is Roof Pitch Ratio?

The roof pitch ratio represents the slope of a roof, expressed as the ratio of vertical rise to horizontal run. It's a crucial measurement in construction that affects drainage, material requirements, and structural design.

2. How Does the Calculator Work?

The calculator uses the pitch ratio formula:

Where:

• \( Rise \) — Vertical height measurement (meters)
• \( Run \) — Horizontal distance measurement (meters)

Explanation: The calculator simplifies the ratio to its most basic form for standard roofing terminology.

3. Importance of Pitch Ratio Calculation

Details: Accurate pitch calculation is essential for proper water drainage, determining material quantities, structural integrity, and compliance with building codes.

4. Using the Calculator

Tips: Enter rise and run measurements in meters. Both values must be positive numbers. The calculator will provide the simplified ratio and decimal equivalent.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between pitch ratio and pitch angle?
A: Pitch ratio expresses slope as a ratio (e.g., 4:12), while pitch angle expresses it in degrees. The ratio is more commonly used in construction.

Q2: What are common roof pitch ratios?
A: Common residential pitches range from 4:12 (moderate) to 12:12 (steep). Flat roofs typically have a 1:48 or 2:12 pitch for drainage.

Q3: How does pitch affect roofing materials?
A: Steeper pitches may require special installation techniques and different materials than shallower pitches. Some materials have minimum pitch requirements.

Q4: Can I use different measurement units?
A: While this calculator uses meters, the ratio remains the same regardless of unit (as long as both measurements use the same unit).

Q5: Why simplify the ratio?
A: Simplified ratios (like 4:12 instead of 1:3) follow industry standards and make it easier to communicate with contractors and architects.