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Repairing the Bottom of a Bifold Door They are a great way to reduce space, but they can be frustrating when they start to slide and scrape the floor. These problems can be easily solved with a few simple changes. If your bifold door is scraping 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 In time, a bifolding door's bottom pivot can loosen