Andy,
Thanks for the input. I agree that the vapor barrier should go towards the inside of the wall system. I wonder how this might be accomplished, however. Ideally (I think) the plastic would go between the studs and the timber frame, but when do you attach it? It would seem to be impossible to have a continuous layer if you wait and attach it from the inside once all the wiring and insulation goes in.
Also, how about wall systems? Is it possible to use a similar system (i.e. studs and then a couple layers of rigid foam)? If so, does the rigid foam need to be supported from below somehow?
So many questions...
Jon
