1. Welcome Hearth.com Guests and Visitors - Please enjoy our forums!
    Hearth.com GOLD Sponsors who help bring the site content to you:
    Hearthstone Soapstone and Cast-Iron stoves( Wood, Gas or Pellet Stoves and Inserts)
    Caluwe - Passion for Fire and Water ( Pellet and Wood Hydronic and Space Heating)

Vapor Barrier for Ceiling?

Post in 'DIY and General non-hearth advice' started by rmcfall, Dec 29, 2008.

Thread Status:
Not open for further replies.
  1. rmcfall

    rmcfall Feeling the Heat

    Joined:
    Nov 28, 2005
    Messages:
    308
    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

    Helpful Sponsor Ads!





  2. beau5278

    beau5278 Member

    Joined:
    Dec 8, 2008
    Messages:
    92
    Loc:
    western NY/northeast PA
    Is this a single story?
  3. rmcfall

    rmcfall Feeling the Heat

    Joined:
    Nov 28, 2005
    Messages:
    308
    yes, single story.
  4. webby3650

    webby3650 Master of Fire

    Joined:
    Sep 2, 2008
    Messages:
    4,374
    Loc:
    southern Indiana
    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

    rmcfall Feeling the Heat

    Joined:
    Nov 28, 2005
    Messages:
    308
    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 Minister of Fire

    Joined:
    Nov 3, 2006
    Messages:
    6,788
    Loc:
    Next to nuke plant Berwick, PA.
    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

    rmcfall Feeling the Heat

    Joined:
    Nov 28, 2005
    Messages:
    308
    this may be a dumb question, but what is "flake" board?
  8. webby3650

    webby3650 Master of Fire

    Joined:
    Sep 2, 2008
    Messages:
    4,374
    Loc:
    southern Indiana
    I believe he is referring to strand board or OSB ( Oriented-Strand Board)
  9. rmcfall

    rmcfall Feeling the Heat

    Joined:
    Nov 28, 2005
    Messages:
    308
    I wondered that, but wasn't sure...
Thread Status:
Not open for further replies.

Share This Page