I have not ever seen anything like this before so I have my theories but would like some opinions. There was heavy condensation on the floor joists under only one section of the house. It was under the kitchen but there were no plumbing leaks. About a 10 sq ft area with condensation and the rest of the floor structure was dry. They had all the crawl space vents closed and there was an open access panel to the crawl space right where all the condensation was located. We had just had some warm weather followed by sharply colder weather just before the inspection which was in the morning around 1130am.

I am thinking that moisture was migrating to the open access panel during to colder night hours as it would have been colder in that area. All the vents were closed up very tightly except for the open access panel near the area with the condensation. Any thoughts?

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