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What does R-value measure in insulation?

Cost of insulation materials

Resistance of insulation to heat flow

R-value is a measure of thermal resistance, specifically how well an insulating material resists heat flow. The higher the R-value, the better the material is at insulating, meaning it reduces the transfer of heat between the inside and outside of a structure. This characteristic is critical for maintaining energy efficiency in buildings, as it helps keep indoor temperatures stable and lowers heating and cooling costs.

In contrast, other factors mentioned in the options, such as cost, thickness, or weight, do not directly pertain to the insulation's ability to resist heat flow. Although these factors can influence the overall efficiency and selection of insulation materials, they do not define the R-value itself. Thus, B accurately reflects the purpose and function of R-value in the context of insulation.

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Thickness of insulation

Weight of insulation materials

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