It's exceptionally important to keep a coop from leaking, so deal with that issue first. Eliminate drafts that may chill your chickens. Then, if you still have moisture problems, it's an indication that venting humidity is an issue. Oh and when you seal up your roof and sides for rain, give the coop a clean down and provide extra bedding in winter.
Some ideas in the links below-
Some ideas in the links below-
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