2010.12.12 Attic Fan Insulating Box

Hi David, no, these are basically there as online storage for my many photos. The box lifts off during the times of year that we would operate the attic fan (a pair of lift handles was added later). Otherwise, it sits static to provide a bit of extra insulation and stop drafts from the attic. I wasn't concerned about a vapor barrier since the attic is a very dry space (and the foam panel has a plastic vapor barrier on both sides). BTW, we moved out of that house approx. 2-1/2 years ago...
Hope that helps...

Have you done anything further on explaining your insulation box? Does the lid lift when fan is on, and does that lid need a vapor barrier?