What size hinges and how many do you recommend for prehanging?
The hinge size and number of hinges needed will depend on the size of your door. If you have a 1 3/8” thick door at a 6/8 (80”) or 7/0 (84”) height, we recommend that you use three, full mortise hinges, 3 ½” x 3 ½” x ¼” radius. The 1 ¾” thick doors in the 80” and 84” heights will require three hinges also, but they should be full mortise 4” x 4” x ¼” radius hinges. When prehanging an 8/0 (96”) door we recommend the use of four full mortise hinges measuring 4” x 4” x ¼” radius. When the weight of the door exceeds 110 pounds, ball bearing hinges should be used.
