I inspected a house last week and found a lot of moisture in the crawlspace along the rim joist, floor sheathing and the end of the floor joists.
I personally believe that the moisture is from the cold air (-25C at time of inspection) migrating through the wall into the crawlspace and condesating when meeting the warm air. The crawl space has heating duct work run throughout and the ducts are NOT insulated.
I have been asked to speculate with the seller on the cause and repair of the issue. (full permission and signed release from buyer who walked away).
Any and all input is appreciated. Thank you.