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Air Leak Sealing

EFFECTIVE R-VALUES FOR FIBERGLASS BATT INSULATION CHART 

Air leakage is not an issue that some insulation manufactures like to bring up.  The reason for this is that air leakage can dramatically affect the R-value of certain insulations.  The R-value measures a material’s thermal resistance ability but does not account for air leakage.  Products can have a stated R-value in an ideal environment, but when an air leakage is created that R-value can be radically reduced.  What this means for the consumer in reality is that the product manufactures labeled R-value may not be anywhere near accurate.  The American Society of Heating Refrigeration Air Conditioning Engineers or (ASHRAE) did a fiberglass insulation study of the before and after installation comparison between the manufacturers stated R-value and what the consumer really receives. Even with perfectly installed fiberglass the actual effective R-value is substantially lower than what the manufacture stated. 

 

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