Understanding R-Values
R-value measures thermal resistance - the ability of insulation material to resist heat flow.
- R-Value Definition Higher R-values indicate better insulating properties. R-value is measured in ft²·°F·h/BTU.
- Material Properties Different materials have varying R-values per inch of thickness.
- Thickness Impact R-value typically increases linearly with material thickness.
- Climate Considerations Required R-values vary by climate zone and building component.
Common R-Values Per Inch
Fiberglass
R-2.9 to R-3.8 per inch
Cellulose
R-3.1 to R-3.7 per inch
Spray Foam
R-3.6 to R-6.5 per inch
Mineral Wool
R-3.0 to R-4.3 per inch
Installation Best Practices
- Proper Installation Ensure no gaps or compression for maximum effectiveness.
- Moisture Control Include vapor barriers when necessary to prevent moisture damage.
- Ventilation Maintain proper ventilation to prevent condensation issues.
- Multiple Layers Consider using multiple layers with staggered joints for better performance.