Air and vapour barriers
Interior sheathing as an air and vapour or vapor barrier
...OSB or plywood for roofs, walls and floors? Well ecoHOME would reply "it depends where, and what other materials you are using!"
Rated at 40NG, 3/4 inch OSB sheathing can be one of the better vapour barriers for home construction in most of Canada. But in order to act in that role, it needs to be on the inside.
Sheathi...