You need adequate ventilation in the crawl space. Three years ago we had a "rat" slab poured in ours.....only 3 ft of space at the best. Got rod of the old dirt floor and plastic, etc. We use mechanics rollers to roll all around under the floor. Have lights, etc. We insulated the cement walls with 2 inch rigid insulation. Keeps it petty good in the winter. Problem with insulation on the joists is that mold will occur. We do have windows (small cellar types) that we open in the spring/summer/fall and close in the winter which provide once cross ventilation and keeps any musty smell out. Had a foundation company do the rat slab. A rat slab is just a concrete pad about 3-4 inches think..the name comes from keeping burrowing animals out.
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