Crawl Space Repair - Whole sections of crawlspace insulation have fallen out

When the fiberglass insulation is installed, it isn't held it place by more than a small metal stick. The only reason it stays in place at all is because it is super light weight...when it stays dry. As soon as it gets a little wet, it becomes too heavy to stay in place. The easiest way for the insulation to get wet is for the humidity in the crawlspace to be very high. All the water vapor soaks right into the fluffy sections of insulation. At this point, it is better to just remove it and get a better product in place.