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  1. #1
    Join Date
    Jun 2007
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    5

    Question Blown in celluose insulation R value and compaction

    Can anyone tell me if the R value of blown in cellulose is based on inches after it is blown in or after it has settled/compacted over time?

    I am curious to know if it is true that as it settles, you would lose R value due to the thickness becoming smaller.

  2. #2
    Join Date
    Aug 2007
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    The Great White North
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    4,045

    Default Re: Blown in celluose insulation R value and compaction

    Quote Originally Posted by vastator View Post
    Can anyone tell me if the R value of blown in cellulose is based on inches after it is blown in or after it has settled/compacted over time?

    I am curious to know if it is true that as it settles, you would lose R value due to the thickness becoming smaller.
    It seems the answers are ... yes , yes and yes. As with any insulation material that composed of a material made of fibers it relies on the " fluffy " nature to maintain it's insulation performance. So as it settles it will lose a portion of it's insulating properties and reducing it's R value.

    In researching this I haven't been able to find a definitive number as to how much reduction of the R value is lost other than it is reduced somewhat.

    Here is a link with some information : http://www.hgtvpro.com/hpro/bp_insul...243847,00.html

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