Testing the building envelope is the latest effort in a decades long push to successfully insulate the exterior envelope of our homes...
I have spent 40 years constructing buildings: walls, floors, ceilings, and have watched first hand the results of the effort to insulate without damaging the structure...
Long ago, we didn't insulate the wall cavity, so moisture, which entered the exterior wall sandwich, did little; it drained out, the residue evaporated and the buildings survived.