Vapor Barrier for Ceiling?

rmcfall Posted By rmcfall, Dec 29, 2008 at 2:05 AM

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  1. rmcfall

    rmcfall
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    I am redoing our kitchen ceiling with some knotty pine boards, and some of the knot holes in these boards are large enough for loose fill insulation to easily drop through. Consequently, I need to tack something to the ceiling joists before putting up the knotty pine boards. So I am wondering what to install? I am leaning toward a 5mm underlayment or 1/8" masonite? Any suggestions as to whether the underlayment or masonite would be better? And while I am at it, should I put up some plastic as a vapor barrier as well?
    Thanks,
    Rob
     
  2. beau5278

    beau5278
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  3. rmcfall

    rmcfall
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    yes, single story.
     
  4. webby3650

    webby3650
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    I helped a friend do this on his ceiling and the knots became a problem for us to. We simply tacked a piece of scrap pine behind the knot as went across the ceiling.
     
  5. rmcfall

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    That's a thought, but in my case the boards are pretty knotty, as well as have worm holes all over. I definitely need something continuous like 4x8 sheets of masonite or underlayment. While I am at it, I'm just wondering whether I should put up a vapor/air barrier as well?
     
  6. Hogwildz

    Hogwildz
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    I have seen where vapor barrier was recommended. You could use tar paper, house wrap, etc.
    I also put knotty pine up on my ceilings & walls of the addition. But it already had flake board up. So I installed over the flake board.
    I have also read where roll plastic will work also.
     
  7. rmcfall

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    this may be a dumb question, but what is "flake" board?
     
  8. webby3650

    webby3650
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    I believe he is referring to strand board or OSB ( Oriented-Strand Board)
     
  9. rmcfall

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    I wondered that, but wasn't sure...
     
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