There's some evidence that using rough sawn wood towards the inside of the hive is good for the bees. The bees coat the rough face with propolis which protects against various bacteria which might hide in the rough face. Also, even during the winter bees need water - for one thing to thin the honey. They cannot eat honey without thinning it. In the winter, moisture condenses on the side of the hive and the bees can use that moisture.
If you don't do anything else, insulate the top of your hive so that moisture doesn't condense on the top and drip down on the bees. I put a piece of rigid foam in the telescoping top. What I use, plus the interior cover (which only has an R value of about 1) gives me an R value of maybe 7 (don't remember exactly) which is enough to keep condensation down. You can see a discussion of what I did here.
The metabolism of honey creates water vapor so even in the winter the hive has high humidity.
Mike
Go into the world and do well. But more importantly, go into the world and do good.