I have a 2 1/2 year old home with a 1/2 basement and crawlspace. The crawlspace has one vent on each of the two walls exposed to the outside, which are open april through november (2 vents total). Shortly after closing, I noticed the sandy / clay soil under the black plastic in the crawl space was extremely damp. After drying the area with fans for 6 weeks, I added scrap 2x4's with flooring laid on top to form a floor, along with carpet scraps laid on top of the flooring. I am now noticing dampness around the edges of the flooring, and smelling mildew. Any suggestions to control the moisture issues???