Snow Load Calculator
Calculate snow load on roofs, assess structural safety, and determine when to remove snow
Roof Dimensions
Length of roof footprint (horizontal projection)
Width of roof footprint (horizontal projection)
Snow Parameters
Depth of snow at thickest point
Density: 60 kg/m³ (3.74 lb/ft³)
Current Snow Load
Formula: Snow Load = Thickness × Density × Gravity
Calculation: 0.000m × 60 kg/m³ × 9.81 m/s² = 0.00 kN/m²
Design Snow Load (Optional)
Local ground snow load from building codes
Snow Types & Density
Fresh Snow
60 kg/m³ - Light, fluffy powder
Damp Fresh
110 kg/m³ - Slightly wet, packable
Settled Snow
250 kg/m³ - Compacted over time
Wind-Packed
375 kg/m³ - Hardened by wind
Very Wet Snow
750 kg/m³ - Heavy, waterlogged
Ice
917 kg/m³ - Remove immediately!
Warning Signs
Sagging ceiling tiles or visible roof deflection
Creaking, popping, or cracking sounds
Leaks or water stains on ceiling
Ice dams or icicle formation
Doors or windows difficult to open
Cracks in walls or masonry
Snow Removal Safety
Use proper ladder safety and have a spotter
Leave a thin layer to protect roofing material
Work from the edge toward the center
Be aware of falling snow zones
Consider professional removal for steep roofs
Never use salt-based de-icers on roofing
Understanding Snow Load Calculations
What is Snow Load?
Snow load is the downward force exerted by accumulated snow and ice on building surfaces. It's measured in pressure units (kN/m² or lb/ft²) and varies significantly based on snow type, thickness, and local climate conditions.
Why Accurate Calculation Matters
- •Prevents catastrophic roof collapse and structural failure
- •Ensures occupant safety and protects property
- •Helps plan timely snow removal operations
- •Complies with building codes and insurance requirements
Calculation Methods
Basic: Load = Thickness × Density × Gravity
Design: Pf = 0.7 × Ce × Ct × I × pg
ASCE 7-16 standard for structural design loads
- Ce: Exposure factor (wind effects)
- Ct: Thermal factor (building temperature)
- I: Importance factor (building use)
- pg: Ground snow load (local climate)
- Cs: Slope factor (roof pitch effects)
Critical Warning: This calculator provides estimates only. For structural design or safety assessments, always consult licensed structural engineers and follow local building codes.