What does R-Value indicate in terms of heat flow?

R-Value is a measure of thermal resistance, indicating how well a material can resist the flow of heat. It quantifies the effectiveness of insulation, with a higher R-Value signifying better thermal resistance. This is particularly important in the context of energy efficiency in buildings because materials with high R-Values reduce heat loss in the winter and keep buildings cooler in the summer, thereby lowering the energy needed for heating and air conditioning.

In practical terms, when comparing insulation materials, those with higher R-Values are preferred as they provide better insulation performance. This aspect is crucial for optimizing energy efficiency and reducing utility costs, making R-Value a key factor in building design and renovation projects.