Our solution included the earth of the crawl space was sealed with a liner made of a 12-mil 3-ply sandwich of high and low-density polyethylene with polyester-cord reinforcement; the liner is treated with an antimicrobial finish that protects against mold and mildew growth on or under the liner. The rim joist was also insulated with 4 nominal inches of open cell foam insulation. This will seal all air leaks in the rim joist area The Foundation walls were insulated with 2 nominal inches of closed cell foam insulation. This will be a continuous seal onto the liner.