Hey Sarah, Thanks for the update. There was a study a while back at the University of Oregon. http://darkwing.uoregon.edu/~hof/f03cob/conclusions.htm NM Adobe: http://www.quentinwilson.squarespace.com/storage/adobecode.pdf http://www.quentinwilson.com/adobe-as-mass/ michael Sarah Booth wrote: > Anyone out there know of a source for technical data on cob R value? > Thanks for your time! Sarah