Air and vapour barriers
Interior sheathing as an air and vapour or vapor barrier
...interior cavities to fill with insulation. But this can easily be overcome with foresight and planning,
Th main photo above and the following wall description are of a project in Val des Monts, Quebec, built by Wakefield Construction.
Wall assembly from the inside out:
Drywall
Horizontal 2x4's (on edge) as strapping, ...