We are starting to look into dealing with a musty basement problem. I realize there a lot of tips on this problem in this website. I have a more specific question about the door to the basement. We have a half door, so there is a lot of air flow to the upper part of the house, and we are concerned that the musty smells are traveling upstairs. It's bad enough that it smells downstairs; we don't want the rest of the house smelling! Will installing a full size well-fitted door help solve this problem? Or are odors likely traveling by another route? Will it make things worse to seal off the basement with a door? Note that there are large windows that we could open in the stairwell to the basement, if we had a closed door. Appreciate your advice.