Using Spray Foam as Vapor Barrier - Does it Actually Work?
Deciding whether to use spray foam as vapor barrier protection usually comes down to one thing: you want a dry house without the headache of stapling up endless sheets of plastic. It sounds like a dream, right? You spray this gooey stuff into your wall cavities, it expands, seals everything off, and suddenly you have insulation and a moisture shield all in one go. But as with most things in construction, the "how" and the "why" matter a lot more than just the "what." ...