Apishield - wasp or hornet trap floor

[Erichalfbee]

The woman who teaches the local beekeeping course taught that if the bees broke their winter cluster, they wouldn't go back into it again. She was against insulation, and I had just started to hear rumors of Derek's work.

I put 3 inches of PIR on a lang deep in late March, and by July they'd drawn out 2 more deeps of empty frames and were filling a super with honey.

With the greatest respect that idea is completely outdated.
Bees will survive most places but if they are warm they will thrive.
I run well insulated poly. It has to be really cold before the bees cluster at all.
Top insulation is good too and works in the summer as well as winter
Lots of people keep insulation permanently in their wooden roofs.