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  1. #1
    Join Date
    May 2009
    Location
    Freeport, Maine
    Posts
    10

    Default Compressing f/g insulation

    If I use fiberglass batts that are thicker by a few inches than the wall space, will I lose insulation value?

  2. #2
    Join Date
    Mar 2009
    Posts
    1,387

    Default Re: Compressing f/g insulation

    Howdy yes compression of the fiberglass does reduce its R value. you might consider instead separating the extra from the batts then installing the sized batts.the ca it pulls apart easily.

  3. #3
    Join Date
    Aug 2007
    Posts
    8,065

    Default Re: Compressing f/g insulation

    Yes.

    It is not the insulation that does the work, it is the trapped air inside it.
    Come to Hidden Content for all your DIY needs

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