air space

What Is The R Value Of 1 Inch Of Air Space?

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What Is The R Value Of 1 Inch Of Air Space? Material R value(ft^2 °F h/Btu Cellulose fiber(1 in. thick) 3.70 Flat glass (0.125 in thick) 0.89 Insulating glass(0.25 in space) 1.54 Air space (3.5 in. thick)1.01 What is the R-value of 1 inch? Thickness (Inches) R-value (in I-P/Imperial) RSI (R-value in Metric) 0.754.50.81 1.06.21.08