September 02, 2010

Summer Rains

 I get comments from people wondering how clay-straw mix called 'cob' hold's-up to rain during construction (prior to receiving a lime based plaster on the exterior walls).  The answer is quite well.  We had about 8-10" of monsoon rains here in southern Arizona this summer and their was minimal erosion to the walls.

The clay on my land contains almost no sand and I don't add any to my mix.  I just add more straw to account for the expansive properties of the clay.  Cob is a fantastic building material.

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