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it is a good thing i think R Value is the thermal resistance of a given material. The higher the R Value the more thermal resistance and the better the insulation. So, an R48 roof system is warmer than an R32 roof system. All insulation materials are rated by their R Value. An inch of rigid insulation has a higher R Value than an inch of fiberglass insulation. Check with the insulation manufacturer for the R Value.
The highest place value is hundreds.
insulation
the highest place value is billions place.
it depends on the r-value of the insulation and the area or temperature range of the climate it is to be installed