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EERE » BTO » Building America » Solution Center Home » Image Gallery » The highly efficient double wall system consists of two sets of stud walls set side by side to create a 12-inch-thick double-stud wall cavity that is filled with a continuous blanket of R-44 dense-packed cellulose insulation.

The highly efficient double wall system consists of two sets of stud walls set side by side to create a 12-inch-thick double-stud wall cavity that is filled with a continuous blanket of R-44 dense-packed cellulose insulation.