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Bi-Fold Door Repair Bi-fold doors can be used to connect indoors and outdoor spaces. They provide a clear view, and easy access to the garden or patio. Over time though they can start to cause problems that require bi-fold door repair. These issues are usually simple to fix and cost-effective. Misalignment Over time, bifold doors may become damaged or misaligned due to wear and wear and tear. The doors might not be closing properly or the track may be sag