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  1. #1
    Join Date
    Sep 2005
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    of the fiberglass pipe wrap insulation with the white vinyl backing? this house is at least 40 yrs old.

  2. #2
    Join Date
    Feb 2004
    Central Kansas
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    You can estimate fiberglass at about R-4 (3.5 - 4.25) per inch and be pretty close. There are different densities with differing R-values, but this should get you a rough figure. Go to Johns Mansville or other insulation sites and they may have more exact data for you.
    Don't confuse me with facts, my mind is already made up.

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