Cob Roofing

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Hello everyone.  I'm new to this list.  I began looking for a way to build
my own house about a month ago.  I found cob and knew that it was the way
to go.  I've searched everywhere and read the archives but I can't find
anything solid on roofing for cob homes.  If I could get any type of
feedback I would really appreciate it.  Thanks.