3 ms·Nit: the usual term is "vapor barrier".by hollerith 2y agoNit: the usual term is "vapor barrier".rascul 2y agoMoisture barriers and vapor barriers are different things that are often confused. And sometimes a thing is both.hollerith 2y agoCan spray-foam insulation be a moisture barrier, though? My guess is no, it cannot.rascul 2y agoYes. That's the problem.