Crawl Space Insulation - Fiberglass Insulation
As moisture builds up in the crawl space, it is absorbed by the fiberglass insulation. Moisture damages the fibers in the insulation, causing them to pull apart from each other. In this photo, you can see the beginning stages of delamination as bits of the insulation begin to "drip" from the floors. The damp insulation also rusts the rods holding it in place, eventually causing it to fail and holds moisture against the floor joists. The added weight causes the insulation to sag, pulling away from the floor.