Insulation R-Value Calculator

Calculate insulation R-value requirements

Insulation R-Value Calculator

Insulation Recommendations

Recommended Min

R-38

Recommended Max

R-60

R-Value to Add

R-38.0

Insulation Thickness Needed to Add R-38.0:

Fiberglass batts:11.9 inches
Blown fiberglass:15.2 inches
Blown cellulose:10.3 inches
Spray foam (closed-cell):5.8 inches
Spray foam (open-cell):10.3 inches
Rigid foam (polyiso):6.3 inches

Calculation Breakdown:

â€ĸ Climate zone: 4 (Moderate climate)

â€ĸ Building part: attic

â€ĸ Current R-value: R-0

â€ĸ Recommended range: R-38 to R-60

â€ĸ Additional R-value needed: R-38.0

💡 Pro Tip:

Higher R-values mean better insulation. Attics typically need the most insulation. Air sealing before adding insulation can improve effectiveness by up to 30%. Check local building codes for specific requirements.

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