Patent ID: 6857243

Claim:
A wallboard comprising: a core having a face and a back substantially parallel to the face; a first edge extending between the face and the back, the first edge having a first-edge profile formed by first, second and third facets, the first facet adjacent the face and forming an acute angle with respect to the face, the second facet connecting the first and third facets and having a second-facet profile angled with respect to the face, the second-facet profile configured to have a shoulder generally equidistant from the first and third facets and to distribute over more than one-half a cross-section for the core a force applied to the first edge, the third face adjacent the back and forming an obtuse angle with respect to the back; and a second edge space from the first edge and extending between the face and the back, the second edge having a second-edge profile corresponding to an inverted mirror image of the first edge.