Cob: Question: cob foundation in clay-rich soil

[Carla Kennedy]

I have been reading this list for awhile, but I think it's my first post.  
I'm planning to start a cob house on my land in Oklahoma next summer, and 
have been soliciting general building information from several people.  My 
grandfather was a builder and my uncles all grew up building houses for him. 
  There is one thing that I was told that I would like more information on.  
My uncle claims that a solid concrete foundation is necessary in Oklahoma 
because the earth is predominantly red clay, and it's a little like building 
on a slow moving stream.  The clay is constantly flowing and will crack your 
walls.  I tend to believe him, but am interested in any thoughts on the 
matter, especially if you've got experience building in the area.  
(Oklahoma, Arkansas, North Texas)
If I do end up using a standard foundation, how does that impact the rest of 
the building process?  What would I have to do differently?
Thank you!
Carla


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