I’ve been discussing hive insulation with an architect/beekeeper. We were pondering EPS (expanded polystyrene) which would make a better insulator than wood – the same thickness is a better insulator and much lighter, though I know bees like a wood surface on the inside. We were considering a thin wood / thick EPS / thin wood sandwich. (Wood on the outside just looks nicer, and can hold a coat of paint.)
My question is, do hive walls need to breathe? If so why?
Another problem with EPS I’m aware of is that if you have to blowtorch the inside of the hive you may melt the EPS, but that’s not the question.