The answer depends on what you mean by "r values".
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insulation
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 answer will depend on the value of r.The answer will depend on the value of r.The answer will depend on the value of r.The answer will depend on the value of r.
To convert U vals To R Vals 1/u = r val
I have been searching for an online calculator that can give me accurate results, I recently found a web site that has a nice R value calculator; you can check it out at this address - http://www.reflective-foil-insulation.com/thermal_analysis.php?application=residential You can calculate all kinds of insulation products and applications, there is also lots of info about R value and U value.