Insulation and vapor barrier with tongue and groove
I am in Southern Indiana which is zone 4a. My wall is this from outside in...Hardie board lap siding, house wrap, 7/16 OSB. That's where I am now. I have 2x4 walls.
If money were no object I would do 3 1/2 inches of closed cell foam. 2nd choice would be and inch or so of closed cell on the OSB and then net the walls and use cellulose. Even an inch of foam is very expensive so the cheap option is netting the walls and blowing in 3 1/2 inches of cellulose.
If this is the way I go do I need some sort of vapor barrier on top of the cellulose and under the tongue and groove? If I need a vapor barrier what kind do I need? I have read there are different classes of vapor barrier. Anywhere from plastic sheeting, to kraft paper such as on fiberglass insulation. I don't really want to mess with drywall if at all possible.
Can you help sort this out?
Posted Sun, 12/08/2013 - 20:01
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