Prodex is a category 1 vapor barrier. A vapor barrier (dampness barrier) refers to any content that stops moisture from passing from the walls or roof of a building. Maybe fine for pros or large accounts, but unhelpful and a really crappy Angle to me, simply a dude hunting for https://www.hotfrog.com/company/6ea34c2224dde8a8e7c2cf8113f9fe78/hand-crafted-metalworks/santa-ana/home-improvement