Hi Snickare,

I am not sure I could even begin to do justice to this topic...even if I wrote 20 pages. It is much more complex and varied than that. It depends if the project is going down the route of "mostly natural/traditional" insulative methods or an augmentation of systems.

It can include "cold roof/rain screen" systems, wall truss (a.k.a. Larsen Truss) systems or just simple "2x" strapping on the outside of a frame, among the most common methods, yet there are more as well.

Drywall thickness isn't really a consideration until a finer element of design is considered. I for one don't use drywall nor promote it. We use traditional lime or earth plasters/renders, textile or wood wall treatments.

Sorry, not much help on this but perhaps it offers some more areas to research with...