In terms of insulation, what is R-value used to measure?

R-value is a measure of thermal resistance in insulation materials. It indicates how well a building material can resist heat flow; the higher the R-value, the better the material insulates. This is particularly important in determining how effectively insulation will minimize heat transfer, which affects energy efficiency in buildings.

An insulation material with a high R-value will reduce heating and cooling costs by keeping heat inside during winter months and outside during summer months, enhancing overall comfort.

The other options do not accurately reflect what R-value signifies. For instance, while the weight of insulation may influence installation and transportation, it does not directly relate to its effectiveness in preventing heat transfer. Similarly, cost-effectiveness and durability are important factors to consider when selecting insulation, but they are distinct from the function of R-value, which solely pertains to thermal resistance.