Tectus Hinges are engineered for their load capacity with two hinges installed.

Officially, adding a third (or fourth hinge) does not increase the rated hinge capacity.

Simonswerk recommends a third hinge for doors taller than 96" in order to check any warping of the door, as long as the door is under 39" wide.

For doors wider than 39 inches, Simonswerk recommends a third hinge installed at 14" below the centerline of the upper hinge.

The centerline of the upper hinge, itself, should be located 10" from the top edge of the door.

Note also that the rated capacity must be reduced for doors over 39 inches in width. See the following document for further information...

Load Specification Guides for All Capacities