[Cob] Lava Rock

[Janet Standeford]

I think the important thing here is to get code to recognize thermal 
mass of course but until then it behooves us to use what tools we have 
and to ensure that we get the effective R value of 19 per 20 inches as 
anything less would require 6 foot walls to pass Building Code!

We all know that to put insulation into the cob walls ruins it's ability 
to breath properly and messes with the thermal mass so until someone 
invests the money to prove thermal mass to the Building Code Creators, 
this is the best we have that I know of.

> Once again, effective r-value is NOT the same as actual r-value:
>
>   http://www.deatech.com/pipermail/coblist/2011/013007.html
>
> Janet's house has an "effective r-value" close to 1 per inch.  The 
> actual r-value for cob is generally below 0.4.
>
> Shannon C. Dealy      |               DeaTech Research Inc.
> dealy at deatech.com     |          - Custom Software Development -
> Phone: (800) 467-5820 |          - Natural Building Instruction -
>    or: (541) 929-4089 |                  www.deatech.com
>
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