Abstract: An elongated strip of control joint material includes a first lateral flange, a second lateral flange, and a central portion laterally interposed between the first and second lateral flanges. The first and second lateral flange each terminate laterally into a respective first and second edge. The central portion includes a first manufactured crease line extending longitudinally along the elongated strip of control joint material. The central portion can transition between a flattened configuration and a folded configuration. The central portion is substantially coplanar with a directly adjacent portion of the first and the second lateral flange in the flattened configuration; and extends vertically away from the directly adjacent portions of the first and second lateral flanges in the folded configuration. The central portion flexes relative to both the first and second lateral flanges in the folded configuration.