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Bifold Door Seal Repair Bifold doors incorporate doors with tracks that are concertinaed to allow you to open and close a space. Over time, they may suffer from a number of typical issues that require expert attention. A lack of regular maintenance could cause your bifold doors to swell up, which can lead to hardware problems and stuck doors. To stop this from happening it is recommended to grease your bifold doors every couple of weeks. Seals that are degrading The seals on bi