I am in the process of designing my own earth sheltered/underground house and I have been considering a variety of methods. The wofati design detailed by Paul Wheaton http://www.richsoil.com/wofati.jsp has helped greatly in refining my design. However, I am curious as to how design and evaluate the structural needs of the roof. I would like to do all the work myself with minimal modern materials, sticking with on site lumber and dirt as much as possible. So if anyone has any expertise on structural geometry, or knows of any good publications, i would appreciate the input. Thanks
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