Does anyone know if upper ventilation is needed with polystyrene hives? Specifically, does moisture pass through the telescoping cover or is it better to configure them as traditional hives for overwintering, with an upper entrance/upper ventilation?
I have used polyhives 22 years. Its water problem is different because in wooden hives the water goes into wood.
If you have a mesh floor, no upper entrance open in winter.
I have solid floors and upper entrance is very essential. Very good is if the bottomboard has 2 inch holes in back corners.
I use inner cover which must have a ventilation gap where wind can blow trough.