For single-family dwellings in Denver, Colorado, the International Energy Conservation Code (IECC) offers the following minimum R-value

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For single-family dwellings in Denver, Colorado, the International Energy Conservation Code (IECC) offers the following minimum R-value ranges for the construction assemblies shown (depending on option). Convert these R-values to the metric equivalent thermal resistance (RSI).
a. Ceiling: 38 to 49 hr °F · ft2/Btu
b. Wall cavity: 17 to 19 hr °F · ft2/Btu
c. Basement wall: 9 to 13 hr °F · ft2/Btu
d. Floor (above crawl space): 21 to 30 hr °F · ft2/Btu
e. Slab-on grade: 5 to 13 hr · °F · ft2/Btu

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