A panel joint for joining first and second adjoining, upstanding wall panels such that their front surfaces are in a common plane and the forward facing corners of their adjoining edges are held tightly together. The panel joint includes first and second joint elements fixed to the back surfaces of the first and second wall panels, respectively, adjacent to their adjoining edges. The first and second joint elements each include upstanding leg portions disposed in spaced parallel relation, with one of the leg portions having a flanged end which bridges the spacing and butts against the side of the other leg portion. Clamping devices link the leg portions of the first and second joint elements.