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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 several ways to fix your bi-folding doors. Here are some common problems and their fixes: Misalignment. Misalignment Misalignment may be the cause of your bi-folding doors not being capable of sealing properly, or creating drafts to your home. This can be caused by the frame's movement due to