Re: Ventilation question - first winter as beekeeper
i think your straw and burlap would likely absorb any moisture, (rising from the broodnest).
plus, the insulative properties should keep it from getting cold.
the queen excluder might get cold enough up there to condense h2o, and if it did, it would drip back down on the bees.
i would use a regular inner cover over the honey super. then an empty super, with 2" (r10) styrofoam inside and resting on top of the inner cover.
for ventilation, i would have one or two screened notches in the inner cover.
beekeeping since june 2010, +/- 20 hives, tf