What does R-value measure in insulation materials?

R-value specifically measures the ability of insulation material to resist the flow of heat. It is a crucial metric in determining the effectiveness of insulation in maintaining temperature, thereby contributing to energy efficiency in buildings. A higher R-value indicates better insulating properties, meaning that the material can effectively slow down heat transfer, keeping spaces warmer in the winter and cooler in the summer.

Understanding R-value is essential for appraisers, as it can affect a property's energy efficiency rating, which is increasingly important to buyers and can influence market value. Insulation materials with higher R-values contribute to lower energy costs, enhance comfort levels within a building, and may even improve the overall value of the property due to these energy-saving attributes.