Cob earth plaster test data plea

[Robert Bolman]

Robert Bolman
888 Almaden St
Eugene, OR 97402
541-344-7196  /  email: robtb at efn.org

I'm building a straw bale house in Eugene, Oregon – a place known for lots
of gentle rain.  I'm presently permitted to put cement stucco on the
exterior of the building and a commercially produced plaster product on the
interior, but I wish to change it all to some form of earth plaster
probably finished off with a coat of lime plaster.  

My building department needs some good information.  They need testing data
on earth plasters taking into consideration variations in clay
expansiveness.  They need numbers.

Any suggestions that anyone could offer would be greatly appreciated.
Sincerely,
Robert Bolman