R-Value and NC

Defined as the Resistance of thermal transference a product has.
xxxThe greater the R-Value the greater the performance of resisting thermal transference.   One must note that it will save you on energy usage within your home using higher R-Value but at what price?
In NC  Wake County R-value currently required by CODE for:
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Know that what products are CODE are made in much more supply therefore at a greater reduced price.  So R-Value products not used by your area’s CODE is usually quite more expensive because it is not being made in significant quantities.
The higher you go in R-Value the dimished return you will get per inch of insulation.  Insulation like a lot of things also works on the principle that “Over-kill is expensive” and usually not worth the investment.   Here is a chart showing the diminished returns of increasing R-Value:
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