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EERE » BTO » Building America » Solution Center Home » Image Gallery » This home’s exterior walls consist of two 2x4 walls; the R-49 double wall cavity is filled with 2 inches of closed-cell spray foam plus dense-packed cellulose.

This home’s exterior walls consist of two 2x4 walls; the R-49 double wall cavity is filled with 2 inches of closed-cell spray foam plus dense-packed cellulose.