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Bi-Fold Door Repair Bi-fold doors can be used to connect indoors and outdoors. They give you clear views and easy access to your patio or garden. In time, they may develop problems that require bi-fold door repair. These problems are usually easy to fix and cost-effective. Misalignment Over time, bifold doors can be damaged or misaligned as a result of wear and tear. The doors may not be closing correctly or the track could be sagging, or the hinges could be loosing. This is one of the most common