(Wines&Vines) - Amador Cellars in the Sierra Foothills is close to completing construction of a new 2,745-square-foot barrel room that is the first winery facility built using Energy Mass (EM) Wall construction, an energy-efficient architectural design developed and patented by Integrated Structures, Inc. (ISI) of Berkeley, Calif. ISI, an architecture, engineering and building design firm, also designed Amador Cellars’ original straw bale cellar building completed in 2003 with 22-inch-thick walls that have a high insulation R-value of R-50. The new building’s walls have about the same thickness but are designed to increase the insulation value to R-100.