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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 by following a few simple steps. Here's how. Bifold closet doors often scratch the floor when carpet is installed or the flooring material is changed. The bottom pivot adjustment can be used to raise the door. A little maintenance is required to keep the hardware free of debris, dirt, and dust. Versatility Bifold doors are a great way to i