I'm having a top bar hive built to order from someone who has a lot of experience with Langstroths, but not TBH. He does build some basic TBHs but has no experience with them. I have 6 Langstroths and have no experience with TBHs. His units currently have a full screened bottom with a full "IPM" board that slides under the screen which will fully close it off.
Does anyone else use screened bottoms?