Insulation Calculator

Calculate insulation material and R-value requirements

Coverage Area = Length × Width | R-Value = Thickness × R/inch

Insulation Formula

R-Value = Thickness (inches) × R per inch
  • R-Value = Thermal resistance rating
  • Fiberglass = R-3.14 per inch
  • Spray Foam = R-3.6 to R-5.0 per inch
  • Cellulose = R-3.2 to R-3.8 per inch

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