Hi! I have been looking at putting something in my hive over winter (so very soon), to help absorb moisture and hopefully stop any from getting into the hive. I have read something like sawdust in a pillowcase put onto the lid, under the roof works. Has anyone used anything in their hives/roof to absorb moisture? I also read you could use insulation to help with moisture. Any advice appreciated. Thank you 
Hello and welcome to the Flow forum! 
If you are wanting something well-made, you won’t go wrong with these instructions by Rusty Burlew. She is a very well-respected Master Beekeeper with a lot of wintering experience:
I think @Eva does something that requires a bit less effort, but maybe she can tell you about that.
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Old hessian (burlap) sack is what I use. Ventilated but absorbes the moisture.
I use multipurpose crown boards over winter with granulated sugar then the hessian sack onto.
Youll always get moisture