The R-value of a concrete tilt-up wall is 1.20. What is its R-value considering air-to-air heat transfer through it?

What will be an ideal response?


To obtain the R-value for air-to-air heat transfer through an assembly, we must include the R-values of inside and outside surfaces (Rsi and Rso), which together add to 0.9, approximately 1.0. Hence, the R-value of tilt-up wall for air-to-air heat transfer = 1.2 + 1.0 = 2.2

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List the three objectives of OBD II?

What will be an ideal response?

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What will be an ideal response?

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