The Challenge of Calculating U-factors for Cold-Formed .
Paul H. Shipp, Ph.D., P.E., F. ASTM Alex McGowan, MBA, P. Eng. Principal Research Associate Building Sciences Group Leader USG Corporate Innovation Center WSP Group 700 N. US Highway 45 760 Enterprise Crescent Libertyville, IL 60048 Victoria, BC, CAN . 1 1 - INTRODUCTION The American