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Bi-Fold Door Repair Bi-fold doors can be used to connect indoors and outdoor spaces. They offer a clear view of the outdoors and easy access to your patio or garden. Over time, they may cause problems that will require bi-fold door repair. Luckily these issues are usually simple and inexpensive to repair. Misalignment Over time bifold doors can become damaged or misaligned due to wear and tear. The doors may not be closing correctly and the track could be sagging or hinges could be loose and require tightening