We have a 30 yr old summer cottage on a Michigan sand dune. The cottage is on a cement block foundation with sand for the crawl space floor. A strong "cottage" smell exists. I assume the sand floor is the main source of the moisture creating the smell. What is the best method of approaching the problem? Can a vapor barrier / concrete slab be added without creating other problems? If we do this, and get other sources of moisture under control, will the smell disipate. Are there other issues we should be concerned with? Finally, any recommended reading sources?