Why Continuous? A typical two or three butt hinge system may cause premature doorway failure in busy entrance ways. Most of any door's weight and stresses are put on its top hinge. With excessive use the top hinge may experience signs of early wear. Once the top hinge fails, the door sags and the entrance quickly becomes a problem. The Markar continuous hinge distributes weight and stresses along the full length of the door and frame supporting the door’s full length up to ten feet. Because Markar continuous hinges are tested for over a million cycles, trouble-free door operation is guaranteed. Download more information here.