We want to insulate our 8x12 coop for the Michigan winter and are having a debate as to which type of insulation to use--fiberglass R13 roll or 4x8 insulated sheathing. The big question is: has anyone experienced a problem with mites getting into fiberglass insulation? The fiberglass R13 would fit nicely between the studs while the 4x8 sheet would require cutting to fit, and wouldn't fill up the wall cavity like the fiberglass would, as the fiberglass is 31/2"thick. For those of you who have the standard fiberglass insulation in your coop walls--any problems with mites? As always, thanks for your help and counsel!