What does the R-value measure in a material?

The R-value measures a material's thermal resistance, indicating how well the material can resist the transfer of heat. In insulation, a higher R-value means better insulation performance, as it reflects the material’s effectiveness at preventing heat loss in the winter and heat gain in the summer. This property is crucial in energy efficiency, as it helps in maintaining comfortable indoor temperatures without excessive energy use.

Thermal resistance is a key characteristic for materials used in buildings, particularly in walls, roofs, and floors where insulation is vital for energy conservation. Understanding the R-value allows homeowners and builders to make informed decisions about which materials to use, optimizing energy efficiency and cost-effectiveness in heating and cooling systems.