Cob: How standards have changed.

[john]

A good source of true R-values is:
http://coloradoenergy.org/procorner/stuff/r-values.htm



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> I toured one of the Frank Lloyd Wright Usonian houses (the one in
> Florence  AL, now open Tuesdays and Thursdays) and was horrified to
> learn that the  walls were two layers of --locally harvested
> --cypress siding, and one of plywood--unknown thickness.  And of course
> the  windows were thick, but single pane glass.
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> snipped from a bunch of people on the coblist:
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>  > ....,,24 inches of dry wood doesn't present much of a thermal break.
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> It presents a thermal break of R-val 30.92 for white pine to 31.44 for
> spruce or yellow pine.  What does your clay panel R-value per inch?
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