Originally Posted by Rain Man
AS, I'm confused. He was asking about an UQ. Aren't you talking about a top quilt? I would think you'd want the wind break outside (underneath) an UQ. Am I muddled?
I was indeed talking about an UQ.
If you have a vapor barrier on the outside of an UQ, but not one on the inside....then your body moisture through radiant heat will enter the UQ and not be able to escape because it is stopped by that vapor barrier. Do that long enough, and you'll wet the insulation, thus reducing it's efficiency.
The rule of thumb with VB's is that if you use one, it goes nearest your body with regards to the insulation. If you use two, then
you can place the second one on the outside, as a wind break.