Air and vapour barriers
Interior sheathing as an air and vapour or vapor barrier
...vapour permeance. By moving the sheathing to the inside, you are simply letting it live up to its full potential as an air barrier and vapour barrier, and eliminating the need to install a separate product to do that job.
One of the benefits of OSB as an air barrier is that it is solid. A polyethylene or foil air barri...