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Bifold Door Seal Repair Bifold doors connect door panels into concertinaed tracks to open and close a space. In time, they can suffer from a number of common problems that require professional attention. Inadequate maintenance can cause your bifold doors to swell up, causing hardware problems and stuck doors. To help prevent this from happening, you should grease your bifold doors every few weeks. Deteriorating Seals Since bifold doors are constantly exposed to the elements, their seals may get deteriorated ove