What goes up must "Fall Down". Hanging Fiber Batt Insulation in the crawlspace was never a good idea and never did work. All batt insulation will pull away from the floor and some will eventually fall to the floor. Instead of wasting money on Fiberglass Insulation proper crawlspace encapsulation with SilverGlo Insulation on the walls and Spray Foam in the Rim Joist will protect your home of the structural damage moisture and mold will cause. Plus crawlspace encapsulation keeps the floors warmer and prevents hardwood floors from buckling.