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Bi Fold Repairs - Save Money and Keep Your Home Secure If your bi fold doors are hard to open or let in a draft it is likely that their hardware has degraded and requires repairing. If you don't address this issue, it could result in costly repairs. No matter if your external or internal bi fold doors are glass or solid, they are susceptible to wear and wear and tear. Regular maintenance can reduce damage. Locks They are a beautiful and practical addition to any home. Like any other door or window they are susceptible to becoming misaligned