In this latest podcast of If Walls Could Talk, PUR Consulting’s Thomas Harris chats about the performance path vs. prescriptive path as it relates to spray foam.
In previous podcasts, we’ve talked about some of the product myths and we’ve touched on vapor control layers and the role different spray foam materials play in providing an inherent vapor control layer. Open cell foams are vapor permeable, while closed cell foams are vapor impermeable—a Class II vapor retarder.