1. What is Roof Slope Ratio?

The roof slope ratio represents the relationship between the vertical rise and horizontal run of a roof. In UK standards, this is typically expressed as a ratio (e.g., 1:4) showing how many units the roof rises for each unit of horizontal distance.

2. How Does the Calculator Work?

The calculator uses the slope ratio formula:

Where:

• \( rise \) — Vertical change (in mm)
• \( run \) — Horizontal change (in meters)

Explanation: The calculator converts measurements to consistent units and calculates the ratio of vertical rise to horizontal run according to UK roofing standards.

3. Importance of Roof Slope Calculation

Details: Proper roof slope calculation is essential for water drainage, structural integrity, material selection, and compliance with building regulations in the UK.

4. Using the Calculator

Tips: Enter the vertical rise in millimeters and horizontal run in meters. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical roof slope ratio in the UK?
A: Typical UK roof slopes range from 1:4 to 1:1, depending on roofing material and building design requirements.

Q2: Why are different units used for rise and run?
A: UK roofing standards commonly use millimeters for vertical measurements and meters for horizontal measurements in slope calculations.

Q3: How does roof slope affect water drainage?
A: Steeper slopes provide better water drainage, while shallower slopes may require additional waterproofing measures.

Q4: Are there minimum slope requirements in the UK?
A: Yes, UK building regulations specify minimum slope requirements for different roofing materials to ensure proper performance.

Q5: Can this calculator be used for other slope calculations?
A: While designed for roofing, the same principle applies to any slope calculation where you need to find the ratio between vertical rise and horizontal run.