R-value (insulation)
Measure of how well an object, per unit of area, resists conductive flow of heat
R-value (insulation)
The R-value is a measure of thermal resistance, specifically how well a two-dimensional barrier, such as a layer of insulation, a window, or a complete wall or ceiling, resists the conductive flow of heat, in the context of construction. The higher the R-value, the more insulating the material is. Higher R-values can reduce heating bills in cold weather and cooling bills in hot weather. R-value can be expressed with in both metric and United States customary units. When expressed in metric, the term RSI-value is often used. R-values expressed in United States customary units are approximately 5.68 times as large as R-values expressed in metric. An R-value can be given for a material (e.g., for polyethylene foam), or for an assembly of materials (e.g., a wall or a window). In the case of materials, it is often expressed in terms of R-value per metre, or per inch in the US. R-values are additive for multiple layers of materials. R-value is defined as the temperature difference needed to...
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