[Cob] R-values

[Mary Lou McFarland]

Does anybody out there have any info on R-values of cob?  How thick do I 
need to go to get a really good rating and would the addition of perlite or 
vermiculite to the mix help in uping the R-value?  In s.w. Iowa it can get 
cold enough that you can damage your skin after five minutes exposure 
outside and in the summer it can be 100 degrees with 80% humidity, so I want 
the best possible R-value.

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