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How to Fix Common Bi Folding Door Repair Problems Bi folding doors allow for the expansion of the interior space and create seamless connections between outdoor and indoor areas. However, as time passes, they could begin to wear out and require repairs. There are a variety of ways to fix your bi-folding doors. Here are a few typical issues and solutions: 1. Misalignment. Misalignment If your bi-folding doors are a challenge to close or open and are