PoleBarnGuru
Bronze Member
A regular 8' ohd will not give 8' of clearance to the floor when open. They usually hang down in the opening by 3-4 inches. That can be remedied I suppose, but it would take careful installation measures and spring tension to get the full 8' of clearance.
Only if improperly installed would an overhead door hang down into the door opening. For a residential overhead door, the clear height will be 1" less than the door call out height, for a commercial door, it will be full height.