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Repairing the Bottom of a Bifold Door Bifold doors are fantastic for saving space however, they can be troublesome if they start to sag or scratch against the floor. These problems can be easily solved by making a few small adjustments. If your bifold door is rubbing against the floor, it's most likely due to a damaged roller or a worn track. The solution is to replace the damaged rollers. Bottom pivot Over time, the bottom pivot of a bifold door could be loosened or even fall off. This usually happens due to cracks or