Calculates the snow load on a roof and provides guidance on when to remove snow based on local building codes and safety recommendations.
Start with your values, or try a preset.
Enter Roof Length (feet), Roof Width (feet), Average Snow Depth (inches), Snow Density (lbs/cubic foot), Roof Slope Angle (degrees), and Critical Snow Load (lbs/square foot) in the units shown.
Read Roof Area, Snow Volume, Estimated Snow Weight, Snow Load per Square Foot, and Recommendation in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
See the inputs and their calculated results.
Roof Length (feet): 20 ft; Roof Width (feet): 15 ft; Average Snow Depth (inches): 6 in; Snow Density (lbs/cubic foot): 10 lbs/cu ft; Roof Slope Angle (degrees): 30 degrees; Critical Snow Load (lbs/square foot): 30 lbs/sq ft
Roof Area: 300 sq ft; Snow Volume: 150 cu ft; Estimated Snow Weight: 1,500 lbs; Snow Load per Square Foot: 5 lbs/sq ft; Recommendation: The snow load is within acceptable limits. No immediate action is required.
Roof Length (feet): 30 ft; Roof Width (feet): 20 ft; Average Snow Depth (inches): 12 in; Snow Density (lbs/cubic foot): 15 lbs/cu ft; Roof Slope Angle (degrees): 30 degrees; Critical Snow Load (lbs/square foot): 30 lbs/sq ft
Roof Area: 600 sq ft; Snow Volume: 600 cu ft; Estimated Snow Weight: 9,000 lbs; Snow Load per Square Foot: 15 lbs/sq ft; Recommendation: The snow load is within acceptable limits. No immediate action is required.
Roof Length (feet): 40 ft; Roof Width (feet): 25 ft; Average Snow Depth (inches): 18 in; Snow Density (lbs/cubic foot): 20 lbs/cu ft; Roof Slope Angle (degrees): 30 degrees; Critical Snow Load (lbs/square foot): 30 lbs/sq ft
Roof Area: 1,000 sq ft; Snow Volume: 1,500 cu ft; Estimated Snow Weight: 30,000 lbs; Snow Load per Square Foot: 30 lbs/sq ft; Recommendation: Remove snow from roof. The load exceeds the critical value.
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