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    KBC's Avatar
    KBC Posts: 2,550, Reputation: 487
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    #1

    Dec 15, 2008, 05:32 AM
    Polyisocyanurate insulation
    Insulation in the building is all polyisocyanurate board.(cyanide reactive foam board with membrane surface)

    Does this product lose R-value during it's lifetime?
    KBC's Avatar
    KBC Posts: 2,550, Reputation: 487
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    #2

    Dec 15, 2008, 05:34 PM

    I have done a little research and have found out the board insulation loses about 1 point off the R-value over about 10 years,then gets to about a 2 point till it levels out in about 13-14 years.
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