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Answered 2010-01-06 08:08:34

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.

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