Bifold Door Repair - How to Fix a Sticky Bifold Door If your bifold doors sag instead of smoothly opening and close, the problem can be solved by a few easy steps. Here's how. Adding carpet or altering the flooring material frequently can cause bifold closet doors scrape the floor. https://bifolddoorsealreplacement40995.blogolize.com/are-bi-fold-door-repair-really-as-vital-as-everyone-says-69752819