Basement Finish Flooring Questions

Discussion in 'Remodel Forum & Blog' started by ManCave, Nov 22, 2014.

  1. ManCave

    ManCave New Member

    Joined:
    Feb 2, 2012
    Location:
    Columbus, OH
    I am finally getting to finish flooring on my basement project and I had a few quick questions.

    First some background. I have 1" XPS insulation against the concrete floor with 5/8" OSB on top of that. Half of the space will be laminate or cork flooring and the other half will be carpet.

    I was just wondering what type of underlayment I should put down under the cork/laminate? I assume something WITHOUT a vapor barrior? Am I right? I was thinking I would use this foam underlayment.

    http://www.lumberliquidators.com/ll/c/Dream-Home-Foam-Underlayment-Dream-Home-HF/10012844

    I am also assuming I don't want any type of carpet pad that has a vapor barrier. Is this also correct? I was just planning on getting basic carpet pad.

    Any info or advice would be greatly appreciated. Thanks!
     
  2. Dana

    Dana In the trades

    Joined:
    Jan 14, 2009
    Location:
    01609
    Yes, you want to avoid putting anything with a vapor permeance less than 1-per above the OSB subflooring, since the 1" XPS runs about 0.8-1.2 perms, and does allow ground moisture to (very slowly) migrate upward. As long as you don't block or severely impede the drying path to the interior, the OSB will be fine.

    The R-value of the carpet is also sometimes an issue, since you need the OSB to stay above the interior air's dew point in summer (which is higher in summer than in winter.) With 1" of XPS you'll be fine in Columbus OH with thinner rugs, but a deep shag could be insulating enough to create mold conditions underneath. Be careful about deep cushy carpet underlayments too the R-values of the layers add up.
     
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  4. ManCave

    ManCave New Member

    Joined:
    Feb 2, 2012
    Location:
    Columbus, OH
    Thanks for the info, Dana! As always, you are very helpful.
     
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