Crawl Space Repair - Ineffective Insulation in Crawl Space

Fun fact: Fiberglass insulation is a terrible idea for basements and crawl spaces. This is because it's absorbent, and thus absorbs any ambient moisture in the air. Since basements and crawl spaces often have humidity issues, the insulation quickly sucks up all of the water and then becomes a waterlogged mess and eventually falls into a useless heap.