Re: Winter Insulation of Hives?
John, Ian, I agree with your statements, because during a long cold spell the bees could starve to death if the there was not enough heat inside the hive for them to move to capped honey. Each spring we see posts on here about dead hives and honey within 1" of the cluster, some added insulation is often wise in northern states. Yes heat can be preserved and we all must winterize to suit weather conditions where we live if our bees are to survive the winter.
If the hive has plenty of honey then I place these items on the hives in this order, and if stores are low the I omit # 1 and 2 and place sugar on a piece of newspaper directly on the frames.
1. queen excluder
2. # 8 mesh screen
3. 2 1/2" shim with 1/2" vent hole
4. Fill shim with cedar wood chips
5. inner cover
6. 3/4" foam insulation
7. outer teli cover
8. felt wrap the hive
Bill...in Southeast Ohio Zone 6A