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<P><FONT SIZE=2 FACE="Arial">Does thermal conductivity of polyisocyanurate roof insulation change over time?</FONT>
<BR><FONT SIZE=2 FACE="Arial">Will the R-value decrease over time? There seems to be conflicting information about this.</FONT>
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<P><FONT SIZE=2 FACE="Arial">Mark Zoeteman</FONT>
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