Do I Need A Vapor Barrier?

Vapor barriers are designed to prevent moisture transfer via diffusion. Because 99% of moisture transfer, in homes is from air-leakage and only 1% is from diffusion, it is more important to have an “air-barrier” instead of  a “vapor barrier”, which was designed for moisture transfer from diffusion.  Closed cell foam and soft foam provide a built in air barrier.

Leave a Reply

Your email address will not be published. Required fields are marked *