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How to Fix Common Bi Folding Door Repair Problems Bi folding doors let in more space and create seamless connections between indoor and outdoor areas. Over time, they can begin to wear out and require repairs. There are a variety of ways to fix your bi-folding doors. Here are some common problems and their solutions: 1. Misalignment. Misalignment The misalignment of your doors could be the cause of your bi-folding doors not being in a position to seal properly, or creating d