hi, I have excess moisture in my old house (~ 1930s) crawl space. It has a very small cellar and the rest is a crawl space that is only about 16 inches and includes plenty of barriers such as ducts andplumbing, and has only 2 vents. It seems that it would be good to place a vapor barrier and possibly close vents and possibly add a dehumidifier BUT due to the low crawl space it would be somewhere between extremely difficult to impossible to install a vapor barrier. Any suggestions? Thanks!