Patent ID: 8720141

Claim:
A building structure comprising: a. a framework of metal studs where each stud has metal walls defining an interior channel extending lengthwise within the metal stud; b. a cellular backing material extending lengthwise within the interior channel of at least a portion of each metal studs; c. a thermally insulating layer extending over two or more of the metal studs in the framework; d. fasteners each extending through the thermally insulating layer, through a wall of a metal stud and into the cellular backing material within the interior channel of the metal stud; and e. cladding attached to the framework of metal studs by means of the fasteners of (d) where the fasteners of (d) either extend through the cladding or the cladding is attached to the fasteners and where the thermally insulating layer (c) is between the cladding and the framework; the building structure further characterized by the cellular backing material having a thickness that is more than 25 millimeters into which the fasteners extend and wherein the fasteners extend to a depth into the cellular backing material that is at least 75 percent of the thickness of the cellular backing material.