learn.howToCalculate
learn.whatIsHeading
R-value measures thermal resistance of insulation. Higher R-values reduce heat transfer; proper insulation is critical for energy efficiency.
Formule
Heat flow = ΔT / R_total (sum all resistances including air films)
Guide étape par étape
- 1R-value = thickness / thermal conductivity
- 2Heat flow = ΔT / R_total (sum all resistances including air films)
- 3Recommended: R-30 attic, R-19 walls, R-10 basement walls (varies by climate)
Exemples résolus
Entrée
Attic insulation R-19 (insufficient for cold climate)
Résultat
Upgrade to R-50 could reduce heating 25-30%
Major savings potential
Erreurs courantes à éviter
- ✕Only insulating attic (walls and basement important too)
- ✕Neglecting air sealing (more important than insulation alone)
Questions fréquentes
Does more insulation always save money?
Initially yes, but with diminishing returns. R-60 attic (vs. R-50) saves <5% extra for higher cost.
What's the best insulation material?
Fiberglass, cellulose, foam have similar R-values per thickness. Choose by cost, environmental impact, and application.
Prêt à calculer ? Essayez la calculatrice gratuite Insulation R Value
Essayez-le vous-même →