A door jamb which is flush with the wallboard. Also a door jamb which provides a pocket into which wallboard fits. The preferred embodiment of this invention comprises a central web having a first surface a second surface, a first side and a second side, with a first right triangular section at the first side and a second right triangular section at the second side. The adjacent leg of the first right triangular section is in line with the second surface and the opposite leg of the first right triangular section projects away from the first surface. Further the adjacent leg of the second right triangular section is in line with the first surface and the opposite leg of the second right triangular section projects away from the second surface.