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  1. #1
    Join Date
    Dec 2007
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    1

    Question Insulating in Crawl Space

    I am wondering what the best way to insulate between the first floor and the dirt. We have a 1830s home that sits anywhere from 6 inches to 2 feet from the dirt. A quarter of the space is a full height cape cod cellar which house all the usual mechanics of the home. Termites (which are controlled) are a huge issue here, so I am afraid to cover up the joists.

    Any thoughts would be appreciated.

  2. #2

    Default Re: Insulating in Crawl Space

    Batting with cheap wire supports every 10 inchs or so. you can access areas easily to run wire etc or what ever you need.
    and put down plastic on the ground and if can afford it put down some crush and run on the dirt first.

  3. #3
    Join Date
    Dec 2007
    Location
    Tennessee
    Posts
    1,778

    Default Re: Insulating in Crawl Space

    Be sure to put good insulation around the rim joist. This will help trap warm air against the bottom of the floor. You won't need heavy or thick batting between the joists, just keep the vapor barrier up and the batts at the bottom of the joists. 3.5" batts with a 5-6" air space above them and well insulated rim joists will keep your floors nice and warm.

    Another option would be 1" styrofoam panels attached to the bottoms of the joists, but those styrofoam panels are a bit pricey.

  4. #4
    Join Date
    Dec 2007
    Posts
    3

    Default Re: Insulating in Crawl Space

    Quote Originally Posted by Infraredsurvey.com View Post
    Batting with cheap wire supports every 10 inchs or so. you can access areas easily to run wire etc or what ever you need.
    and put down plastic on the ground and if can afford it put down some crush and run on the dirt first.
    Why would you put down crush and run in the crawl space? We have dirt and 6M plastic on top. Does the gravel help keep the moisture down? We live on a river bed w/ the river about 100ft from our home so the water table is a serious concern. Our subfloor is 32" above ground surface. Thanks!

  5. #5
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Insulating in Crawl Space

    Does the gravel help keep the moisture down?
    No it doesn't.

  6. #6

    Default Re: Insulating in Crawl Space

    Crush and run or sand or some form of drainage material will help any condensation that may accumulate on the plastic.-just a little better than dirt.here is a thermal pic of a poorly insulated crawl all the red is heat loss from above and the reason your are smart enough to do what you are asking advise about.
    www.infraredsurvey.com
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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