A method for forming a wall structure, the method comprising:
- positioning a frame within a casting bed having a plurality of upright surfaces defining a generally rectangular interior area, the frame comprising first and second spaced apart members extending fully along a width dimension of the casting bed and a plurality of studs interconnecting the first and second spaced apart members, the studs each extending fully along a length dimension of the frame;
- orienting the frame within the casting bed to provide a first space between the frame first member and an associated first upright surface of the casting bed and to provide a second space between the frame second member and an associated second upright surface of the casting bed;
- positioning a forming member in overlying relation above the frame, the forming member comprising a one-piece layer of insulating material sized to extend fully along the width dimension of the casting bed and fully along a width dimension of the frame and to fully cover and encapsulate the frame within the casting bed, the forming member defining a plurality of integrally-formed rectangular protrusions, each said integrally-formed rectangular protrusion having a length dimension extending fully along a length dimension of the forming member and fully along the length dimension of the frame in a parallel and spaced-apart relationship to one another to define a plurality of rectangular-shaped channels therebetween;
- orienting the forming member within the casting bed in overlying relation above the frame to provide a third space between the forming member and the first upright surface of the casting bed and to provide a fourth space between the forming member and the second upright surface of the casting bed, wherein the third space defines respective length and width dimensions equal to, and in overlying registration with, the first space, and wherein the fourth space defines respective length and width dimensions equal to, and in overlying registration with, the second space;
- placing uncured concrete within the casting bed and allowing the concrete to cover the forming member and substantially fill the channels, wherein uncured concrete is allowed to fill the first and third spaces to form a top beam portion of the wall structure and wherein uncured concrete is allowed to fill the second and fourth spaces to form a toe portion of the wall structure;
- and
- allowing the concrete to cure.