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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 a seamless connection between outdoor and indoor spaces. Over time, they can be worn out and require repair. Luckily, there are many solutions to fix your bi folding doors. Here are some common problems and solutions: Misalignment. Misalignment If your bi folding doors are difficult to open or close creating drafts within the home or not sea