Bill, I've used 1" blue styrofoam insulation board in some overwintering
experimental yards. Some chewing, but not much.
I didn't see a problem with condensation in singles, since the bees kept
the bottom of the insulation warm. Thus condensate occurred on the side
walls and ran out the entrancees.
--
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com
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