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Bifold Door Repair - How to Fix a Sticky Bifold Door If your bifold doors sag rather than smoothly open and close, the problem can usually be fixed with some easy steps. Here's how. Adding carpet or a flooring material change frequently can cause bifold closet doors scratch the floor. The bottom pivot adjustment can be used to raise the door. It is important to maintain the hardware by cleaning it free of dirt, dust and other debris. Versatility Bifold doors are an excellent option to up