Another good link.  http://www.roofhelp.com/Rvalue.htm
 This one states "Inadequate insulation and air leakage are leading causes of energy waste  in most homes".  Yeah, yeah.  Knew that.  http://www.ornl.gov/sci/roofs+walls/insulation/ins_01.html
 This one (same site, different page) has a link  that will take some info (including zipcode) and supply the  r-values for the different components of your home.  http://www.ornl.gov/sci/roofs+walls/insulation/ins_05.html
 Here's the full length article by Dave South.   http://www.iowafoam.com/R-Value%20Myth.doc "My  experience is that R-value tables can be used as indicators. However, they need  modifications  to make them relevant in real world conditions."
 This  one's interesting . . . paper insulation  http://eev.liu.edu/heat2002/data/packard.htm
 I'd  better get back to work . . . 
 ElfN
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