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  1. #1
    Join Date
    Jun 2009
    Posts
    1

    Default attic insulation thickness

    Is there a common rule on the thickness of batt fiberglass insulation for attics? I understand that the R value should be around 40 for our house. Live in Northwest Michigan.

  2. #2
    Join Date
    Mar 2009
    Location
    OKC
    Posts
    247

    Default Re: attic insulation thickness

    R value should be printed on the bats, i don't think they make an r 40 batt you would probably have to use 2 layers, a 6 inch bat is around R 19.
    HOPE THIS IS HELPFUL!

    Oklahoma City, OK

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