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Urethane Spray Foam Insulation R Value

Building scientists have recognized that air leakage has a greater impact on energy consumption than does R-value. In fact, air leakage contributes to as much as 50% of building energy loss. Building design that promotes air-sealing offers far greater potential energy savings than added R-value. While R-value measures an insulationís ability to inhibit conductive heat flow, it does not measure convective heat flow (or air leakage). Air leakage creates an environment thatís uncontrollable by building occupants who often describe the environment as too hot or too cold, too drafty or too noisy Ė all of which create an uncomfortable space and reduce productivity.

Since R-value doesnít measure an insulationís ability to control air leakage, design professionals and facility owners must look at other material properties to determine which products are suitable for healthy, energy-efficient design and construction. Air permeance, for instance, measures the air leakage rate of an insulation material. An insulation material that leaves gaps or seams permits air movement within the cavity. And when moisture-laden air travels through the building envelope, problems can occur. Additionally, if this moisture-laden air is traveling from the exterior to the interior of the building, air conditioning equipment must work overtime to remove the moisture. Not only does this result in excessive energy consumption, but this can also pose a threat to the quality of the indoor environment.



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Urethane Spray Foam Insulation R Value

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