Lookee Lookee what I found.
http://www.ornl.gov/~roofs/Zip/ZipHome.html
That calculator isn't configured for papercrete construction.  Note 
that you can update the calculator by inputing the fuel prices from 
your current bill.  You also can update the prices for various 
insulations.
I think I could create a spreadsheet that does essentially the same 
thing and design it to apply to papercrete.  Getting all the lookup 
tables right would be the big problem.  I need to find the data.
I would love it if I could convert it into a Java applet like that one 
so it could get posted to a web page.  I'm not a particularly great 
Java programmer.  I do have full understanding of the math.
Any volunteers to collaborate on such a project?
 
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