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Repairing the Bottom of a Bifold Door Bifold doors are great space-savers however they can be frustrating if they start to sag or scratch against the floor. These problems can be easily fixed with a few simple changes. If your bifold door is scraping against the floor, it's likely due to a damaged track or roller that is worn out. The damaged rollers must be replaced. Bottom pivot Over time, the bottom pivot of a bifold door could be loosened or even fall off. This is typically due to a cracked or broken wood piece