[Cob] light straw R-value

[umbrella at netspace.net.au]

I'm wondering if the R-value of light straw could be compared to that of 
aerated concrete, for which there must be plenty of data.  I assume rammed 
earth or adobe has fairly similar R-value to concrete, so as its density is 
reduced by having more air pockets the R-value may increase in a similar way to 
aerated concrete.  I can't believe that mud is actually worse than concrete, as 
data from below indicate.





http://www.litebuilt.com/English-T3.html

has a table showing R-value vs. density of aerated concrete

http://coloradoenergy.org/procorner/stuff/r-values.htm

says poured concrete is 0.08 / inch

http://www.cmit.csiro.au/news/viewpress.cfm/51

says a 200mm mud wall has R = 0.4, about 0.05 / inch




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