1. What is Slope Ratio?

Slope ratio is a mathematical expression that represents the steepness or incline of a surface, such as a patio roof. It is calculated as the ratio of vertical change (rise) to horizontal change (run).

2. How Does the Calculator Work?

The calculator uses the slope ratio formula:

Where:

• \( \text{rise} \) — Vertical change in feet
• \( \text{run} \) — Horizontal change in feet

Explanation: The slope ratio provides a unitless measurement that indicates how much vertical elevation change occurs per unit of horizontal distance.

3. Importance of Slope Calculation

Details: Proper slope calculation is crucial for patio roof design to ensure adequate water drainage, structural integrity, and compliance with building codes. The correct slope prevents water pooling and potential damage.

4. Using the Calculator

Tips: Enter the vertical change (rise) and horizontal change (run) in feet. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical slope ratio for patio roofs?
A: Typical patio roof slopes range from 1:12 to 4:12 (rise:run), depending on roofing material and local building codes.

Q2: How does slope ratio differ from slope percentage?
A: Slope ratio is expressed as rise:run (e.g., 1:12), while slope percentage is (rise/run) × 100%. A 1:12 slope equals approximately 8.33% slope.

Q3: Why is proper slope important for patio roofs?
A: Proper slope ensures effective water drainage, prevents water accumulation, reduces the risk of leaks, and maintains structural integrity.

Q4: Can I use different units for rise and run?
A: Yes, as long as both measurements use the same units (feet, inches, meters), the ratio will remain consistent.

Q5: What's the minimum slope recommended for patio roofs?
A: Most building codes require a minimum slope of 1:48 (¼ inch per foot) for proper drainage, but specific requirements vary by location and roofing material.