How to Replace Bifold Doors Many home improvement stores sell bifold doors as kits which include doors and track for installation. The door should be approximately 1 inch smaller than the frame opening. If your bifold closet doors sag open it could be because of an unintentional top sliding track https://repairingbifolddoors03656.azzablog.com/30828770/14-questions-you-re-afraid-to-ask-about-bi-fold-repairs