Ice Dam Risk Calculator

Ice Dam Risk

Evaluate ice dam risk on your roof based on insulation levels, attic temperature, roof slope, and outdoor conditions.

Attic Insulation R-Value

Outside Temperature (°F)

Roof Slope (degrees)

Snow on Roof (inches)

Adequate Roof Ventilation

Formula

Risk = (Insulation Risk x 0.35) + (Temp Risk x 0.25) + (Snow Risk x 0.25) - Slope Reduction - Ventilation Reduction; Insulation Risk = max(0, 100 - R-Value x 2.5)

Frequently Asked Questions

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