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Bi Fold Repairs - Save Money and Keep Your Home Secure If your bi fold doors are hard to open or allow drafts, it is likely that their hardware is degraded and requires repairing. If you don't take care of these issues, it could lead to a costly repair bill. No matter if your external or internal bi fold doors are glazed or solid, they are vulnerable to wear and wear and tear. Regular maintenance will minimise the damage. Locks They are a beautiful and practical addition