Proper insulation reduces energy costs, improves comfort, and prevents moisture problems. This calculator estimates insulation quantities based on area, type, and desired R-value (thermal resistance).
R-value requirements vary by climate and location. Walls typically need R-13 to R-21, attics R-38 to R-60, and basements R-10 to R-15. Higher R-values provide better insulation but cost more. Check local building codes for minimum requirements in your area.
Fiberglass batts are DIY-friendly and economical for standard stud spacing. Blown-in insulation fills irregular spaces and is ideal for attics. Spray foam offers the highest R-value per inch and air sealing but requires professional installation.
Always wear protective gear when installing insulation: gloves, long sleeves, dust mask, and eye protection. Ensure proper ventilation in attics to prevent moisture buildup. Don't compress fiberglass insulation as this reduces effectiveness.
Quick Tips
- Always order 10-15% extra materials for waste
- Check local building codes before starting
- Measure twice, cut once — verify all inputs
Frequently Asked Questions
Depends on climate. Walls R-13 to R-21, attics R-38 to R-60. Check local codes.
Yes for attics if existing insulation isn't damaged or moldy. Add layers perpendicular.
Spray foam has highest R-value, but fiberglass batts are most economical for DIY.
In cold climates, place on warm side of insulation. Not needed in warm, humid climates.
For R-38, about 10-14 inches fiberglass. R-49 needs 16-18 inches.