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How to Fix Common Bi Folding Door Repair Problems Bi-folding doors allow for a seamless transition between indoor and outdoor spaces. Over time, they can be worn out and need repairs. There are plenty of ways you can repair your bi folding doors. Here are a few typical issues and solutions: 1. Misalignment. Misalignment Misalignment may be the cause of your bi-folding doors not able to seal properly, or causing drafts to your home. This can be due to the frames moving in different climates, or the normal w