Method of Fabricating a Wall Structure

A wall structure comprising a wall frame, said wall frame comprising comprises a first support member that is substantially parallel to a second support member, each of said first and second support members comprising a first end and a second end, and wherein a third support member connects a first portion of the first support member to a first portion of the second support member and a fourth support member connects a second portion of the first support member to a second portion of the second support member, and, optionally, wherein one or more internal support members may be disposed between and parallel to the third and fourth support members, each of said one or more additional support members having a first end that is connected to the first support member and a second end that is connected to the second support member, wherein one or more spaces are defined by the first, second, third, fourth, and, if present, one or more internal support members of the wall frame, wherein the one or more spaces are at least partially filled with a polyurethane foam layer and wherein a surface of the polyurethane foam layer forms a backing to the wall, and wherein an external layer is not disposed on a portion of the surface of the polyurethane foam layer that forms the backing of the wall.