
My soil is extreme clay and I'm using this same soil for the walls. What's cool is that i'm using the same soil removed during the excavation of the hillside; that this studio is now bermed (see earlier blogs).
So the excavated clay soil becomes a 'local' resource used in making all the walls. If you include the cost of the excavation, and the straw used with the clay to make the 'cob', it's about $1,000 in primary materials. With that you get all the structural walls that also act as a thermal mass system. So the design of thermal mass in this structure, gets me a free heating and cooling system by utilizing the daily temperature cycles that make up a desert climate. This is how to extremely leverage $1,000 into the substantive basis for a comfortable and sustainable living environment.
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