I have been using my sugar boards with the 1/4" mesh on them as a bottom board for ventilation. Any reason that I should not be doing that? I couldn't think of any, but I have been told that I am not the sharpest knife in the drawer..... :-D You know what I mean. Just thought that I would ask.
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Does the sugar board have a lid on it? Which way is it? You do need between 1/4" and 1" space between the bottom of the bottom box and the bottom of the bottom board. A reversible usually has 3/8" on one side and 3/4" on the other or something close to that.
I've run hives with no bottom boards. As long as the hive is strong enough to defend against robbing, they will be fine.