and the bees are sticking it to U.
On my recent inspections of my hives I did encounter that comb building between the upper and lower frames, in the brood nest.
The concept of the brood nest must be understood. The bees like to keep it compact and tend to expand brood rearing from the center of the " ball " or cluster, outwards, up, or, down, left and right or, on the sides. Got you confused :?: :?: :?:
You should have noticed that if the bulk of the brood nest area is in the lower box, frames mostly filled with brood, the expansion is of course upwards and outwards from the center and in the case of the upper frames the brood will be on the bottom of the frame, usually in the center. If the brood nest or cluster area is in the upper box than the expansion is downwards. Bear in mind that the bees like to keep the brood area compact and if there is some extra space between upper and power frames they will fill it with comb and the queen will lay eggs there. In my case there were drone cells ocupying the space and the brood area is in the upper box of a two deep setup. I pulled the upper frames out and scraped the comb off, and of course destroyed the brood. I also inserted a frame of partially drawn comb in the middle of the brood area. We are in some mild weather where I live and I don't think there is a risk in adding the frame into the brood area at this time.
To keep the bee space between boxes at optimum you would have to measure your equipment, boxes and frames to see if you have the correct space. I have observed that there is a difference in the thickness of the top bars between wood and plastic. To have a perfect setup you would have to adjust the frame rest ledge to accomodate either wood or plastic and use only one, or the other, in a given box.
There was a posting by Jim Fisher, recently, on the subject of non standarization of hive equipment.
Hope I've made some sense here. :)