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I wonder how BEopt calculated the assembly R-value for roof and ceiling separately. Like for the roof and ceiling that shares same nominal R-value, the assembly R-values are different. And the assembly R-value of ceiling almost equals to its nominal R-value while for roof, there's difference between these two. Thanks!

I wonder how BEopt calculated the assembly R-value for roof and ceiling separately. Like for the roof and ceiling that shares same nominal R-value, the assembly R-values are different. And the assembly R-value of ceiling almost equals to its nominal R-value while for roof, there's difference between these two. Thanks!