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AZ ROC C-40 Insulation Practice Questions - Arizona ROC C-40 Insulation Examination Exam

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A wall section consists of inside air film (R-0.68), 1/2-inch drywall (R-0.45), wall cavity insulation (R-13.00), 1/2-inch OSB sheathing (R-0.62), continuous rigid polyiso board (R-5.00), and outside air film (R-0.17). What is the total nominal R-value of this assembly?
Correct Answer:
R-19.92

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