R-Value (insulation)
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R-Value (insulation)

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.The R value or R-value is a measure of thermal resistance used in the building and construction industry. Under uniform conditions it is the ratio of the temperature difference across an insulator and the heat flux (heat flow per unit area, dot Q_A) through it or R = Delta T/dot Q_A. The bigger the number, the better the building insulation''s effectiveness. R-value is the reciprocal of U-value. Around most of the world, R-values are given in SI units, typically square...