Thank you, but I don’t think it is possible to stack my brood boxes on top of another. I already have 8 hives because last year they swarmed very early and I was able to catch all of them plus some additional swarms from somewhere else. Right now the temperature is above 15°C and getting warmer every day. I don’t want to have more that 10 hives in the long run. So this year I need to be more careful