Abstract: An improved stud wall structure comprising a folded T-shaped windstrip brace member installed in a saw kerf extending diagonally across the structure for substantially eliminate racking. The T-shaped brace member has a double layer top member portion and a pair of spaced apart flanges extending substantially perpendicularly from said top member portion. The flanges are unconnected at their respective outwardly extending edges, and fasteners such as nails driven through the brace member wedge the unconnected flanges against the sides of the saw kerf to hold the brace member in place on the structure.