See the pic below. This tbh has a sbb. I covered it with a 1 x 10. In the center it dips a bit. Right below the entrance hole. I did not notice it until I hived the package yesterday. I went out to look at them this afternoon. It looks like they can squeeze through this gap and enter through the screen. They are using the entrance hole too.
Should I brace the bottom board up to close the gap?
With that gap. Would/Could my stronger hive rob'em