Extract from a recently released book:
Peter: Generally, Steve, if they have a honey arc on the top of the brood frame they probably have a box of about the right size and you just super above it.
Steve: If they see there’s honey above their heads how will they find out that there’s more space above that for storing more?
Peter: They find out, don’t worry about that. If you had a standard National brood box you often won’t find a honey arc because it’s wall to wall brood, every cell right to the outside.
Steve: Right.
Peter: When they get to that stage, if you’ve got a nice prolific queen and she’s
laying up every cell, there’s only one thing you need to give them – another brood box on top. Not a super; a brood chamber. If she’s a less prolific queen and you have got the honey arc then you don’t need another brood box because she isn’t going to go up there, you need to put shallows up there. Even when they are five supers high they find the space; they are up there filling the top box.