R-Value
R-value is a measure of thermal resistance that shows how well a material resists heat flow. Higher R-values mean better insulation and less heat transfer, which improves energy efficiency and comfort.
💡 Key Takeaways
- ✓R-value is a measure of thermal resistance that shows how well a material resists heat flow. Higher R-values mean better insulation and less heat transfer, which improves energy efficiency and comfort.
- ✓High R-value is only effective when installed correctly without gaps.
- ✓R-values are cumulative, so layering can improve performance.
- ✓Moisture, compression, or poor installation reduce effectiveness.
R-Value
/ˈɑːr ˈvaljuː/
Definition
R-value is a measure of thermal resistance that shows how well a material resists heat flow. Higher R-values mean better insulation and less heat transfer, which improves energy efficiency and comfort.
What does R-value measure?
It measures a material’s resistance to heat flow.
Source: The Cooling Company
Quick Facts
How R-Value Works
Higher R-values slow heat transfer.
Real-World Application
Builders choose higher R-value insulation for attics and exterior walls in colder climates to reduce heat loss.
Pro Tip
Choose insulation based on climate and location in the home, not just the highest R-value.
“Choose insulation based on climate and location in the home, not just the highest R-value.”
Important Things to Keep in Mind
- High R-value is only effective when installed correctly without gaps.
- R-values are cumulative, so layering can improve performance.
- Moisture, compression, or poor installation reduce effectiveness.
Did You Know?
R-value started in the U.S. but is now recognized worldwide in building standards.
FAQ
Is a higher R-value always better?
Not always. Space constraints and moisture resistance also matter.
Can I combine insulation types?
Yes. Layering materials can increase total R-value.
Does wet insulation lose R-value?
Yes. Moisture reduces insulation performance and can cause damage.
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