Our Builder doesn't use any type of Vapor Barrier
My advice is that you do definately want to use house wrap (brand is probably not the end all) to control your air movement. We ended up using Tyvek since that's what Home Depot had, but would have used anything else. The key is to make sure your contractor puts it on in one piece around the entire house as he's able. Then the windows/doors are cut out later. A special tape is used to seal ALL of the seams, tears, etc.
P.S. Again, no expert. Just passing on what I've learned.
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