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I would wait before I insulate the things. Buildings and such sweat because of a difference in temperature. If the temperature is the inside as it is outside, then no condensation can occur. Generally, if no heat is used and it's vented to the outside, then the only place it can sweat would be on the floor, if the floor is in contact with the ground. For example, no heat, floor is in contact with ground, winter freezes everything and in the spring, when warm air arrives, the floor remains cold from the soil, the floor will sweat. The basic principle of attic insulation in houses is the same, vent the attic to stabilize the temp inside to what it is outside and the attic can't sweat. If you are not going to heat the building and will vent it and it's not in contact with the ground or vapor barriered from the ground, then it can't sweat. The only variable you'll need to be concerned about is the amount of spontaeneous heat the hay will generate, in particular, if you allow it be stored wet and some decompositon occours.
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