When installing faced insulation into exterior walls, are there any benefits or detriments to adding an additional vapor barrier to either the non-faced side of the insulation?
1 Answer
not 100% certain on this, but a double vapor barrier will actually cause harm as the moisture will have no where to escape to. Especially if you place it on the non-faced side. If you place it on the already faced side, it probably wont hurt, but is pointless as you already have the barrier .