John
I've never had to close the bottom board myself, but I do lay something as a
wind break for the screened bottom board. But of course your area may be
different. I suggest leave it open they will be fine and in my opinion they will
do better.
I've given this to our state VP as he has hives on a windy hill top.
Russ Dean
webmaster
_West Virginia Beekeepers Association_ (http://www.wvbeekeepers.org/)
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