r-value

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    Understanding floor protection requirements for Jotul #8 (circa 1980's)

    TL;DR: What does this mean? 2 layers of 3/8" millboard where K=0.84 BTU IN/FT² H °F required. Does this mean that this k value is required? First of all, I can't find a straight answer for how to convert a k value with these units into an R value. Second, by saying "where required", is it...