Moisture is something to be managed. A vapor barrier can cut down on earthy smells, mildew, and general humidity.

A dirt floor in a basement or crawl space can be a major source of moisture ... to floor joists or concrete slabs. Installing a vapor barrier is one of the most effective ways to manage this ...

The Basement ... and repair Crawl space encapsulation seals a crawl space off from the outside to stop moisture and high levels of humidity from getting inside. Solutions include vapor barriers ...