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Bi Folding Door Repair Tips Bi-fold doors allow you to completely open up your space and connect indoors to outdoors. They are ideal to let the sun and fresh air in, but they must be maintained in a timely manner to avoid damage. There could be a myriad of problems with your bi-folding door. Luckily, they're easy to fix! Cracked Pivot Pins If you've recently installed carpeting or changed the flooring material in your home, you could be noticing that your bi-folding doors scrape at the bottom.