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Bifold Door Seal Repair Bifold doors are a wonderful addition to any home, but they need regular maintenance and proper installation for correct operation. This includes a thorough integrity check and lubrication, as well as a report of any issues to prevent them from occurring in the future. To reduce sticking, bifold doors are designed to be a little smaller than the frame. However, this also means that air can leak in through the gaps. To fix this, install a weather seal. Damaged Seals Seals and