Ice Dam Prevention Calculator
Calculate the insulation R-value and ventilation needed to prevent ice dams based on your climate zone and current insulation.
Inputs
sq ft
:12
Results
Target R-Value
49
Additional R Needed30
Insulation to Add9.4 inches
Ventilation NFA10 sq in
Estimated Cost$6,750
How to Use This Calculator
- Enter the attic floor area (sqft) and current R-value.
- Set the target R-value per ENERGY STAR recommendations for your climate zone.
- Enter soffit vent and ridge vent areas to assess current ventilation NFA.
- Review additional insulation needed, required ventilation NFA, and heat cable length for eaves.
- Address insulation and air sealing first -- heat cables treat symptoms, not the root cause.
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