Re: Wintering loss Survey
Well you could keep the foam board all year inside the outer cover; if you use wood inner covers w entrance that would be good too for upper entrance. During the winter though, think of the warm moist air from the bees respiration (and CO2) and when it rises it will not condense on a cold surface, it will run down the sides of the hive. Not everyone uses an upper entrance during the winter. I glue popsicle sticks inside my covers, even on the foam, gives it a bit more ventilation.
Western Catskill Mountains