Product Guide Vapor Retarders Photo: BuildingGreen, Inc. Behind the recommendations Related articles Behind the recommendations Related articles Vapor Retarders More about Vapor Retarders How "Smart" Vapor Retarders Work Vapor retarders are supposed to keep our buildings dry, but they sometimes keep them wet instead. Enter the "smart" vapor retarder. The Hidden Science of High-Performance Building Assemblies Any four walls and a roof make an enclosure, but for efficiency, comfort, and durability, those elements have to be meticulously designed and installed. Using WUFI to Prevent Moisture Problems WUFI software helps predict and prevent moisture problems based on site, climate, building materials, mechanical systems, and more. Go with the Flows: The Promise and Peril of Hygrothermal Modeling Tools modeling heat and moisture flows in building envelopes, such as WUFI, offer vital information for architects and engineers-but their misuse can do harm. Talk Perms Like a Pro: The Science of Water Vapor Faced with managing water vapor in buildings? Who isn’t? Put down that polyethylene and learn to talk like a building scientist.