29 Jan '16, 1pm

Energy Nerd: Smart Vapor Retarders for Walls and Roofs

Energy Nerd: Smart Vapor Retarders for Walls and Roofs

Smart vapor retarders aren’t magic. In a recent article in the Journal of Light Construction , Ted Cushman addressed common misunderstandings and exaggerations that accompany the marketing of smart retarders. “In the field, you may hear salesman as well as contractors offering a whole grab bag of unscientific theories,” Cushman wrote. “Contrary to what you may hear, this class of vapor barriers is not a one-way gate that lets vapor pass through in only one direction. Vapor diffusion through a smart membrane, like vapor diffusion in still air, moves from more humid to less humid. … Products on the market today also don’t have ‘active vapor transport.’ That term refers to materials that can move vapor through the material against the direction of the vapor drive — what you might call ‘uphill’ — when voltage is applied to the material.”

Full article: http://www.greenbuildingadvisor.com/articles/dept/musings...

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