Cob: Insulation for cob

[The Van Wey Family]

Hey, I apologize as this may have been covered before ( please allow me
the newcomer to the list allowance!), but has anyone ever though about
or tried to add styrofoam balls or peanuts to the cob mixture. It seems
the "voids" it would create would cause a little better insulative value
for the wall overall. And it doesn't seem that you would lose that much
in strength. Maybe you could even add chicken wire or stucco lath to the
cob walls as you are laying them up to compensate for any loss of
strength. I am interested in building one of these things possible here
in SW Montana, but the insulation value is making me question it. Did I
hear right that a cob wall only has about an R-0.25/inch?!?

Thanks,

Shane Van Wey