Re: Some topbar questions
1) I noticed this past summer they made more sidewall attachments when they were drawing and quickly filling combs during a flow. The combs were still very soft so the builders must have decided they needed extra support. I started running my hive tool or a sharp knife down the sides to make sure they were freed before inspecting them. I do think the angle helps reduce attachments though.
2) I have peaked roofs and love the look but they are more of a pain to make. One nice aspect of these hives is you can decide how much work and creativity you want to put in. There is nothing wrong with functional but simple.
3) I've used all the different typical sizes and I would term the spacers handy, not a pain. I had a problem with the bees building a monster comb, 3" wide at the top. I ended up taking it after the bottom part collapsed because I wanted to get the normal spacing back. The spacers also helped when I did a chop n crop from a Lang nuc into the TBH. I just used the Lang bars with the spacers in between until they built up enough that I could take out the Lang bars.
3rd yr - 1 KTBH & 4 KTBH nucs - TF - USDA Zn 6b