Abstract: A wall edging system for strengthening the wall intersections of buildings replaces the conventional metal corner bead used on drywall joints. The principal element of the system is an extruded plastic strip having a thickened, arcuate central area and two outwardly extending flanges which are othogonally oriented to one another, so that the thickened central portion runs along the seam between the orthogonally intersecting walls, and the flanges extend outwardly along the thickened central portion to be nailed into the drywall to secure the strip to the edge. Means is provided for providing a purchase for the mud that is applied over the flanges, and in addition to the strip there are other pieces defining two-leg and three-leg inside and outside corners, these pieces having tongues extending from each of the legs which slip beneath the central, thickened portions of the adjacent linear strips to provide a secure meeting at the corner.