Abstract: Construction members and methods of forming archways and the like in wood or metal frame construction is disclosed. The member is of an elongate planform having a central body of the width of the archway to be formed, with a plurality of tabs at each side thereof which may be bent at right angles to the body and, once the member is curved as desired, nailed or screwed to the structure to define the desired shape prior to finishing the same. In an alternate form, the body is wider than the archway to be formed, with the tabs spaced inward from the edges thereof so as to be spaced in accordance with the archway width. The outer extending edges thereby provided in the archway, once installed, provide a finishing edge for the wallboard finishing the structure. Various embodiments and materials including metal and plastic for the invention are disclosed.