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How to Replace Bifold Doors A lot of home improvement stores sell bifold doors as kits which include the doors and track for installation. The kit should be about an inch smaller than the frame opening. If your bifold doors are squeaking open, it could be due to a a loose guide pin on the top track or if the rotating floor pin on the bottom is in a wrong the way or not in place. The problem can be solved quickly and cheaply. Cost Bifold doors can transform any home with their sleek and modern appearance.