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Q: I am extending a kitchen out into an addition that was built on a slab. I will need to frame the slab to raise the deck five inches to the same plane as the original kitchen. Should I lay a vapor barrier on the slab before framing? If so what should be used as the vapor barrier? Also can I insulate after framing, before laying down plywood subfloor? Do I need a vapor barrier between insulation and subfloor? What type of insulation? I will be laying reclaimed oak flooring. The project is in Michigan. The addition is a two story structure, well built and there is no evidence of any water problem. I look forward to receiving your advice.

A: Since your questions are more directly related to home construction I would recommend you visit Ask The Builder: www.askthebuilder.com. Great web site and he has an extensive FAQ section and Craig Carter answers emails.

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