Lloyd Spear says concerning screened btm boards::

>I don't know about "everyone", but I leave them on all year, and
>personally know of two others who do likewise.  Between us, many hundreds
>of hives are so involved (I have 75).  With temperatures of -20F, and
>sometimes snow completely covering the hives, there is no noticeable
>damage.  All hives have generous upper entrances.

Lloyd, don't you also wedge the inner cover so that the front has a 3/8"
opening so that air flows through the hive?  I remember you demonstrating
this system at the Beekeeping Seminar held last March in Beaver, PA.

Jim

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