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Resently, we added on a kitchen / mudroom to our home. For the ceiling in the kitchen we left the joists exposed with 2x6s visible across them. To insulate above this I used the “non-itch” R-25 batts from Owens-Corning that are wrapped in thin red plastic. They are great to use. Truly “non-itch”. But, will this offer the necessary vapor barrier or should I have put something down before the batts were rolled out? Like maybe house wrap or tar paper or …?
Wudda ya think?
Thank you – David
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I am pretty sure the bats don't count as vapour barrier. The ones I have seen have a zillion holes in them, probably to let air in/out during installation. Where I live the only legal vapor barrier is 6 mil poly, and it has to be installed on the warm side of the insulation (i.e. before the drywall goes on).
Not meaning to sound repetitve, but if the board is already up, you could look into vapor barrier paint. I have read about it, but never used it.
*From what I understand two coats of gloss latex enamel work well as a vapor barrier. It's not as good as the more expensive and sometimes hard to find vapor barrier paint. A little research may save some money.