Vapor retarder/barrier or not?
I am in the process of building a 1400sq.ft. detached garage in Kansas City, MO. I have fiber cement siding, then Tyvek, then OSB attached to 2X4 stud wall 16″OC.
I plan to insulate with Roxul Comfortbatt R-15 after air-sealing every crack and seam with foam and/or caulk. It will get drywall and paint, and will be heated and cooled.
My question is this: Do I need a vapor retarder and/or barrier at all? If so, what type/brand should I use?
Thank you in advance for any help you can offer.
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