Vapor Barriers, Crawl Spaces & Floors

Discussion in 'Insulation and Radiant Barriers' started by ScratchingMyHead, Jul 8, 2014.

  1. Jul 8, 2014 #1

    ScratchingMyHead

    ScratchingMyHead

    ScratchingMyHead

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    We have a 100 year old camp in humid Northeast that is closed for the winter. We just replaced the floor joists and subfloor and put a 6 mil vapor barrier on the dirt in the minimally ventilated crawlspace (2-3 feet), but it can't be sealed to the stone foundation and there will still be a lot of moisture beneath the floor. The floor is un-insulated. Can we put down a second vapor barrier between the subfloor and floor without creating moisture issues? Each side can dry away from the barrier so it seems that there should not be a problem, but the crawlspace vents will be closed in the winter.
    All expertise apprecaited.
     
  2. Jul 8, 2014 #2

    nealtw

    nealtw

    nealtw

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    No , better to work on a perimeter drain to dry the crawspace.
     
  3. Jul 9, 2014 #3

    nealtw

    nealtw

    nealtw

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    BTW, welcome to the site.
     
  4. Jul 9, 2014 #4

    ScratchingMyHead

    ScratchingMyHead

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    Thanks for the welcome and the opinion. Yes we have additional plans re drainage but given the site we won't fully dry out the crawlspace. Interior moisture has been bad enough that I would like a vapor barrier from below, but don't want to cause the joists and sub-floor to retain more moisture than necessary.
     
  5. Jul 9, 2014 #5

    nealtw

    nealtw

    nealtw

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    The subfloor is considered a vapour barrier and you deffinity don't want a barrier below the joists, good airflow will keep them dry. A perimeter drain on the outside at the depth well below the fill level and footing level is best, water proof the foundation.
     
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