This has been a ongoing topic of discussion every so offten. I am inclined to believe that depending where you are located in the country and taking into consideration the types of winters you are subject to that the use can different. I did a experiment this winter with two hives, with SBB installed on both, with 1" foil side in, insulation with notches cut out of the sides and back to let small amounts of air to pass through. Both were equipted with made, ventilated inner covers with saw cuts on the sides and in the front that were up high enough under the Polystyrene tops so air did not blow directly into the hives. One of the inner covers had 1/2" foilside down insulation with notches cut out of the sides with absorbant material under the foil sided insulation and set on some frame, wedge boards, on the screen of the inner cover. The other had the same type of inner cover with only the absorbant over the wedge boards, on the screens of the inner cover. At no time during the bad weather did I notice any condensation issues. Both of the hives come through the winter strong and no noticeable differences in the colonies due to the slight variations in hive make up.