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sagent....here in eastern pa. 3/8 x 4' x 50' fanfold is an R1.5 and sells for about $36, and if I shopped around better prices could probably be had. For 2000 sf that would run about $360. IMHO, any chance you have to increase the r value in your home, you should do so. Especially if it only costs $360. Not sure but there may also be a federal tax credit for doing so.
 
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