6 years ago I bought a 2 story, 1200 sq ft home that was built around 1890, in south central Pennsylvania. The rear half of the house which is an addition has a crawlspace. The original front half of the home has a basement with stone foundation and a dirt floor covered with a layer of stone. There are two windows in the basement which are normally covered over. During this time of year the humidity levels reach 70-80% and the basement gives off a horrible odor that rises up into the 1st and 2nd floors of the home. I run a small dehumidifier that I empty once a day, and it makes a difference but does not eliminate the odor completely. The smell is sometimes unbearable and i'm sure it cannot be healthy. i am looking for a more permanent solution. I was thinking of lining the whole basement and crawlspace with a vapor barrier but i am not sure if that is recommended especially since when it rains heavily, the basement floor is covered in a few inches of water. I was also thinking of removing the roll insulation in the basement ceiling, installing a vapor barrier over the ceiling and and then installing foam insulation over top. Does anyone have any advice?