Here is another idea that may work for you especially if you have access to old corrugated metal roofing or even cut offs left over from other jobs:http://altbuildblog.blogspot.com/2014/12/building-adobe-wall-4-putting-on-cap.htmlI hope that will help.
thanks ches. wood is so precious. but maybe just putting the iron sheets right on the rammed earth that has a peak
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