The exterior access to this crawl space was in good shape. However, it was uninsulated and it was not air tight. This means it allowed heat to radiate in and warm humid air to flow into the crawl space. We installed an interior friction fit door behind the access door. The interior door provides an R-10 of insulation and air seals behind the crawl space access. This seals a big hole that adversely impacts the crawl space otherwise.