Re: Overwintering, Candy Boards, Ridged Covers, and Ventilation?
Would think some minimal ventilation is required to remove excess moisture. I'd have some concern about the plastic inner cover as it can absorb no moisture as does wood and will easily drip. Candy boards are good insurance. Leave sufficient honey and fall feed 2:1 sugar syrup, so the bees fill any empty cells and candy board is only insurance.
My suggestion is build a wood inner cover with a lip of the top side and under side. Cut at least a 2 inch round hole in the center, no screen over hole. Make the under side rim at least 3/4"(or whatever depth you want for candy) and use it as a candy board. Use a tin can(cut 3/4 deep) or something round to let candy set and remove.
Make the top rim 3/8" and cut a 1.5 inch wide notch in top lip at front.
Air will enter through bottom entrance, vent hive and exhaust through 2" hole in center and over the top side of inner cover and out the 1.5 inch opening. This will exhaust the moisture that will condense on the under side of the plastic inner cover.
If you always do what you always did, you'll always get what you always got!