Even the humble roof has benefitted from a re-think. In normal use this 40MM thick design provides a high level of insulation, keeping the bees warm in the winter and cool under the summer sun. However, in times of high nectar flow it can be inverted to provide an upper entrance. This technique is often used in scandinavia but is rarer in the uk. The technique provides improved hive ventilation and direct access to the supers by the foragers. It can also be used to allow drones to escape if the queen has found her way into the supers and laid drone brood.
There is now an empty space underneath the top of the hive, which has been designed to accommodate bags of feed that you may or may not place on top of the frames for feeding. When you are not using feed, you can close the space to avoid the bees constructing anything else within this area.