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.
/ˈɑːr ˈvaljuː/
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
Higher R-values slow heat transfer.
Builders choose higher R-value insulation for attics and exterior walls in colder climates to reduce heat loss.
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.”
R-value started in the U.S. but is now recognized worldwide in building standards.
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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