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Bifold Door Repair - How to Fix a Sticky Bifold Door If your bifold doors sag instead of smoothly opening and close, the problem is usually fixable with some easy steps. Here's how. Bifold closet doors often scrape the floor when carpet is added or the flooring material is changed. This can be corrected by raising the door using the bottom pivot adjustment. It is important to keep the hardware in good condition by getting rid free of dirt, dust and debris. Versatility Bifold doors ca