Your home's heat and a/c rely on its insulation to maintain a stable climate. Often times in a crawl space or damp basement, insulation becomes moldy on the paper backing causing air quality issues. Upgrading your home's insulation can improve the home's air quality and lower your energy bill. Insulation in your attic can settle down to a low value requiring you to add more blown-in insulation. Sometimes rodents make a home and produce animal waste jeopardizing the quality of your home's air, unexplained urine odors often result in us finding mice colonies.
For a crawl space after all molded items are removed from your Carolina crawl space, only then would we replace with new up to code insulation .
For your Carolina attic, if there are no air quality issues we would just add to your current blown insulation to increase your value. If there are air quality issues with the old blown insulation, we would remove old and replace with new blown insulation.