1. What is Roof Slope?

Roof slope (also known as roof pitch) is the steepness of a roof expressed as a ratio of vertical rise to horizontal run. It's typically measured in inches of rise per foot of run and is crucial for proper water drainage and structural integrity.

2. How Does the Calculator Work?

The calculator uses the roof slope formula:

Where:

• \( \text{Rise} \) — Vertical height in inches
• \( \text{Run} \) — Horizontal distance in feet
• \( 12 \) — Conversion factor to express slope in inches per foot

Explanation: The formula converts the rise-run ratio to the standard roofing measurement of inches per foot, making it easier for contractors and builders to work with.

3. Importance of Roof Slope Calculation

Details: Proper roof slope is essential for effective water drainage, preventing leaks, supporting snow load, and ensuring the longevity of roofing materials. Different roofing materials require specific minimum slopes.

4. Using the Calculator

Tips: Enter the vertical rise in inches and horizontal run in feet. Both values must be positive numbers. The calculator will provide the slope in inches per foot.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical roof slope for residential buildings?
A: Most residential roofs have slopes between 4:12 and 9:12 (4 to 9 inches of rise per foot of run).

Q2: What's the minimum slope for different roofing materials?
A: Asphalt shingles typically require 2:12 minimum, while metal roofing can go as low as 1/4:12 with proper sealing.

Q3: How does slope affect roof cost?
A: Steeper slopes generally cost more due to increased material requirements, complexity of installation, and safety considerations.

Q4: Can I measure slope without climbing on the roof?
A: Yes, you can measure from inside the attic or use smartphone apps with level functions to estimate the slope.

Q5: What's the difference between slope and pitch?
A: While often used interchangeably, pitch is the ratio of rise to span (total width), while slope is rise to run (half the span).