Quote:
Originally Posted by Dollar Bill
Be sure to place a vapor barrier on the bottom to stop ground moisture intrusion.
I'm thinking if you close it up when humidity is low you'll be fine as built as it sounds like you've got it pretty well sealed up.
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It will get pretty warm inside from the sun and since warm air expands, it will find a way out or make a way out. Then when it cools off in the evening, air will come back in bringing moisture with it. And a muggy summer day in Minnesota has plenty of moisture!