"EPA's / DOE Home Performance with Energy Star protocol (the one intended for existing structures) sets the minimum at R-5 under floors. They do insist, however, on spray-foam insualtion. Makes sence to me, given foam's dual-purpose of…"
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A presentation by Greg Labbé in April 2014 on retrofitting vintage home for energy efficiency. He talked about basic building science, brick houses, movement of heat energy and moisture in and out of the house, air barrier and water barrier, house…