Dan, since you live in a zone 7 area R 50 - 60 would be great, it will
also help in your air conditioning bills. you do have central air ,
yes, because summer heat rises, and i know the Carolinas are hot...
Im in zone 5 we go to - 20- 25, i put in R 100, Remember
minimums are just that the minimum so you dont go broke paying the
utilities, before you cant pay the bank . people would if allowed, build
houses without insulation, Its also the best investment you can make, as
interest rates are low and gas and electric will always go up.