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Bifold Door Seal Repair Bifold doors connect doors with tracks that are concertinaed to let you open and close an area. In time, they could suffer from a few typical issues that require expert attention. Inadequate maintenance could cause your bifold door to jam, resulting in hardware problems and stuck-up doors. To prevent this from occurring it is recommended to grease your bifold doors every couple of weeks. Seals that are becoming less durable Seals on bifold doors can be dam