A damaged bottom bar and bottom slats are usually the result of repeated force to the door. The door can be further damaged by continuing to use it when there is slight damage, but not enough to inhibit operation. Typically, the door will continue to take the repeated force and at some point, will no longer operate.
The Heavy Duty Bottom Bar provides protection from forklifts and pallet jacks. It is 5.5x stronger than a standard bottom bar because it is taller and more rigid. Since it is so rigid, it will not only protect itself, but the slats above it. If the bottom bar cannot flex, then the slats above cannot flex and crease.
Watch the Heavy Duty Bottom Bar in action...
Heavy Duty Bottom Bar