Any help will be appreciated. If warm air + cold air = condensation, can it also = moisture? I have no insulation in between my floor joist, and also i have ceiling heat. It seems like the heat goes right through my floor and into my crawl space. I have no H2O standing in my crawl space, and there is 6 mil plastic covering the ground, yet the ground under the plastic is damp/wet. No leaking pipes that I can see, the gutters and the ground is sloping away from the house directing the H2O away, and the cynder blocks that are under ground are H2O proofed.( I even added more foundation vents to my house ). If i use the foil back fiberglass insulation do you think that will help out with the moisture/condensation? So the heat from my ceiling reflects off the foil and stays in my house instead of going into my crawl space and mixing with cold air causing condensation/moisture?