Fiberglass Loose-Fill Insulation for the Perfect Fill ™ System. Virtually eliminates all gaps and voids. Typically 2-3 times more fiberglasss in cathedral ceilings, walls, or floors compared to standard building insulation. Improved thermal performance. Excellent sound control properties. Reduced air infiltration. J.C. Insulation Co., Inc. is an insulation contractor that has served San Antonio since 1994. The company offers many types of Fiberglass Batt and Blown Insulation, Wall Sprayed AsureR Fiberglass Insulation and Sprayed Foam Insulation for both residential and commercial applications.