What does R-value measure in insulation?

R-value is a measure of the thermal resistance of insulation materials, which reflects how well a material can resist heat flow. A higher R-value indicates greater insulating effectiveness, meaning the material will provide better thermal insulation and help maintain consistent indoor temperatures. This is crucial in building and construction, where efficient insulation plays a critical role in reducing energy consumption and improving comfort levels.

While the weight of the insulation material, cost-effectiveness of installation, and environmental impact of the materials are important considerations in the selection and application of insulation, they do not define the R-value. R-value specifically quantifies insulating performance based on how well the material inhibits the transfer of heat.