Insects and critters
Insects and critters of all kinds love damp environments and wet materials. Rot and decay occur in damp environments causing structural damage.
Natural Airflow
The natural airflow in a house is from bottom to top. This sucks the moist air and everything in it up into the living areas of the home.
Mold Spores
Mold spores, odors, humidity and critters create a very unhealthy environment for people. Many people are allergic to these things, and experience a host of symptoms and don't realize that their dirt crawl space is affecting their health
Crawl Space
Dirt crawl spaces do not have to be wet or flooded to be extremely unhealthy.
Drainage Matting
The dimples allow better conductivity for water to get to the perimeter drainage or sump pump located in the lowest spot of the crawlspace.