1. What is the UK Snow Load Calculation?

The UK snow load calculation per BS EN standards determines the characteristic snow load on a roof structure. It accounts for shape, site conditions, exposure, and thermal factors to ensure structural safety during snowfall.

2. How Does the Calculator Work?

The calculator uses the BS EN snow load equation:

Where:

• \( \mu \) — Shape coefficient (dimensionless)
• \( s \) — Site snow load (kN/m²)
• \( C_e \) — Exposure coefficient (dimensionless)
• \( C_t \) — Thermal coefficient (dimensionless)

Explanation: The equation accounts for roof shape, local snow conditions, wind exposure, and building thermal properties.

3. Importance of Snow Load Calculation

Details: Accurate snow load estimation is crucial for structural integrity, preventing roof collapse, and compliance with UK building regulations.

4. Using the Calculator

Tips: Enter all coefficients as positive values. Typical values range from 0.2-2.0 for μ, 0.5-1.5 for Ce, and 0.7-1.2 for Ct.

5. Frequently Asked Questions (FAQ)

Q1: Where can I find site snow load values?
A: UK snow load maps in BS EN 1991-1-3 provide s values based on location altitude.

Q2: How to determine shape coefficient?
A: μ depends on roof shape/slope - flat roofs (0.8), pitched roofs (0.2-1.6), curved roofs (0.2-2.0).

Q3: What affects exposure coefficient?
A: Ce accounts for wind exposure - sheltered sites (1.0), normal (0.8), exposed (0.5).

Q4: When is thermal coefficient important?
A: Ct reduces load for heated buildings (typically 0.8-1.0). Use 1.0 for unheated structures.

Q5: Are there special cases?
A: Consider drifting snow, uneven accumulation, and exceptional snowfalls for critical structures.