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Bi Fold Repairs - Save Money and Keep Your Home Secure If your bi fold doors are difficult to open or letting in drafts, it is likely that the hardware has degraded and requires repairing. Ignoring can cause a large repair bill. If your exterior or internal bi fold doors are glass or solid, they are susceptible to wear and tear. Regular maintenance can reduce damage. Locks Bi fold doors are beautiful and functional design elements for any home. Like any windows or doors,