Re: screen bottom board or not, that is the question, building a new TBH
I have two TBH's, both have screened bottoms, with a hinged door cover. The hinged door also has two cut outs. So this way I can remove the cutouts when it gets hot, which is a great reason for the screen bottom in the first place, but the closed door helps the bees feel closed in and safe. The 2nd reason for the hinged bottom is if you drop comb filled with gooey honey you can get it out easily, no scooping out with a spoon.
"Glory is fleeting, but obscurity is forever."