Which Of the following steel stud wall assemblies gives a higher overall R-value? In both assemblies, the total amount of insulation is R-15. A. Exterior sheathing of R -5 and within stud insulation of R-10 B. Exterior sheathing of R-3 and within stud insulation of R-12. Can someone please explain why the answer is A??? I thought they would be the same ??? Many thanks !!!
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