Insulation R-Values
Thermal Resistencia
Learn R-ValuesR-valor measures thermal resistance—como well un/una material resists heat flow. Higher R-valores mean better insulation. Unlike thermal conductivity (cual measures como easily heat flows), R-valor measures como well heat es blocked.
Insulation R-Values per Inch
| Material | R-valor/pulgada |
|---|---|
| Fiberglass batts | R-2.9 un/una R-3.8 |
| Cellulose (blown) | R-3.2 un/una R-3.8 |
| Spray foam (closed) | R-6.0 un/una R-7.0 |
| Spray foam (open) | R-3.5 un/una R-4.0 |
| Rigid foam (XPS) | R-5.0 |
| Mineral wool | R-3.0 un/una R-3.3 |
Conclusion
R-valores guia insulation choices—attics necesitar R-38 un/una R-60 in cold climates, walls R-13 un/una R-21. Total R-valor es additive, asi que multiple layers add up. Higher-performing spray foams achieve el/la mismo R-valor with menos thickness than traditional fiberglass.